Mike Jacobs
LightNews LightNews
banner
mikejacobs.bsky.social
Mike Jacobs
@mikejacobs.bsky.social
460 followers 46 following 600 posts
Math teacher in Ontario/Mountaineer/Munroist/Exiled Yorkshireman/Dad to two great kids.
Creator of Yohaku Puzzle https://www.yohaku.ca/
Author of Onwards and Upwards. https://tinyurl.com/OnwardsUpwardsHills .
#RunEveryDay
Posts Replies Media Videos
mikejacobs.bsky.social
Start your day with this #yohaku. Fill in cells with 9 different whole numbers to get products shown in each row/column. More free puzzles and books/ebooks for all ages can be found at yohaku.ca
Use 9 different whole numbers in a 3 by 3 grid. The numbers in the top row multiply to 84. The numbers in the middle row multiply to 44. The numbers in the bottom row multiply to 540. The numbers in the left column multiply to 280. The numbers in the middle column multiply to 264. The numbers in the right column multiply to 27.
February 3, 2026 at 11:44 AM
mikejacobs.bsky.social
Start your week with this #yohaku. Fill in cells with 9 different factors of 180 to get totals shown in each row/column. #mathsky #iTeachMath
Use 9 different factors of 180 in a 3 by 3 grid. The numbers in the top row add to 138. The numbers in the middle row add to 83. The numbers in the bottom row add to 10. The numbers in the left column add to 21. The numbers in the middle column add to 70. The numbers in the right column add to 140.
February 2, 2026 at 11:44 AM
mikejacobs.bsky.social
Here's a #yohaku to take you into the weekend. Fill in cells with 16 different factors of 540 to get totals shown in each row/column AND shaded cells contain triangle numbers. #mathsky #iTeachMath
Use 16 different factors of 540 in a 4 by 4 grid. The numbers in the top row add to 11. The numbers in the second row add to 96. The numbers in the third row add to 78. The numbers in the bottom row add to 256. The numbers in the left column add to 23. The numbers in the second column add to 46. The numbers in the third column add to 140. The numbers in the right column add to 232. The central four cells contain triangle numbers.
January 30, 2026 at 12:11 PM
mikejacobs.bsky.social
Try this shady #yohaku. Fill in cells with 9 different integers to get products shown in each row/column AND sum of 4 shaded cells is -8. #mathsky #iTeachMath
Use 9 different integers in a 3 by 3 grid. The numbers in the top row multiply to -198. The numbers in the middle row multiply to 105. The numbers in the bottom row multiply to -75. The numbers in the left column multiply to 81. The numbers in the middle column multiply to -77. The numbers in the right column multiply to -250. The sum of the integers in the 2 by 2 square at the top left of the grid is -8.
January 29, 2026 at 1:33 PM
mikejacobs.bsky.social
Start your day with this #yohaku. Fill in cells with 9 different factors of 280 to get totals shown in each row/column. #mathsky #iTeachMath
Use 9 different factors of 280 in a 3 by 3 grid. The numbers in the top row add to 45. The numbers in the middle row add to 188. The numbers in the bottom row add to 19. The numbers in the left column add to 185. The numbers in the middle column add to 26. The numbers in the right column add to 41.
January 28, 2026 at 1:18 PM
mikejacobs.bsky.social
"Start your day with this #yohaku. Fill in cells with 9 different whole numbers to get products shown in each row/column. More free puzzles and books/ebooks for all ages can be found at yohaku.ca
Use 9 different whole numbers in a 3 by 3 grid. The numbers in the top row multiply to 132. The numbers in the middle row multiply to 24. The numbers in the bottom row multiply to 476. The numbers in the left column multiply to 102. The numbers in the middle column multiply to 231. The numbers in the right column multiply to 64.
January 27, 2026 at 11:43 AM
mikejacobs.bsky.social
Start your day with this #yohaku. Fill in cells with 9 different factors of 270 to get totals shown in each row/column. #mathsky #iTeachMath
Use 9 different factors of 270 in a 3 by 3 grid. The numbers in the top row add to 37. The numbers in the middle row add to 195. The numbers in the bottom row add to 22. The numbers in the left column add to 62. The numbers in the middle column add to 183. The numbers in the right column add to 9.
January 26, 2026 at 3:44 PM
mikejacobs.bsky.social
Here's a #yohaku to take you into the weekend. Fill in cells with 16 different factors of 560 to get totals shown in each row/column AND shaded cells contain Fibonacci numbers. #mathsky #iTeachMath
Use 16 different factors of 560 in a 4 by 4 grid. The numbers in the top row add to 399. The numbers in the second row add to 105. The numbers in the third row add to 55. The numbers in the bottom row add to 47. The numbers in the left column add to 125. The numbers in the second column add to 97. The numbers in the third column add to 20. The numbers in the right column add to 364. The central four cells contain Fibonacci numbers.
January 23, 2026 at 11:48 AM
mikejacobs.bsky.social
Try this shady #yohaku. Fill in cells with 9 different integers to get products shown in each row/column AND sum of 4 shaded cells is -4. #mathsky #iTeachMath
Use 9 different integers in a 3 by 3 grid. The numbers in the top row multiply to 138. The numbers in the middle row multiply to -136. The numbers in the bottom row multiply to -220. The numbers in the left column multiply to 176. The numbers in the middle column multiply to -255. The numbers in the right column multiply to -92. The sum of the integers in the 2 by 2 square at the top left of the grid is -4.
January 22, 2026 at 11:44 AM
mikejacobs.bsky.social
Start your day with this #yohaku. Fill in cells with 9 different factors of 462 to get totals shown in each row/column. #mathsky #iTeachMath
Use 9 different factors of 462 in a 3 by 3 grid. The numbers in the top row add to 54. The numbers in the middle row add to 27. The numbers in the bottom row add to 197. The numbers in the left column add to 19. The numbers in the middle column add to . The numbers in the right column add to 189.
January 21, 2026 at 12:05 PM
mikejacobs.bsky.social
Start your day with this #yohaku. Fill in cells with 9 different whole numbers to get products shown in each row/column. More free puzzles and books/ebooks for all ages can be found at yohaku.ca
Use 9 different whole numbers in a 3 by 3 grid. The numbers in the top row multiply to 182. The numbers in the middle row multiply to 24. The numbers in the bottom row multiply to 408. The numbers in the left column multiply to 64. The numbers in the middle column multiply to 357. The numbers in the right column multiply to 78.
January 20, 2026 at 11:49 AM
mikejacobs.bsky.social
Start your week with this #yohaku. Fill in cells with 9 different factors of 126 to get totals shown in each row/column. #mathsky #iTeachMath
Use 9 different factors of 126 in a 3 by 3 grid. The numbers in the top row add to 28. The numbers in the middle row add to 26. The numbers in the bottom row add to 72. The numbers in the left column add to 22. The numbers in the middle column add to 73. The numbers in the right column add to 31.
January 19, 2026 at 12:02 PM
mikejacobs.bsky.social
Here's a #yohaku to take you into the weekend. Fill in cells with 16 different factors of 672 to get totals shown in each row/column AND shaded cells contain triangle numbers. #mathsky #iTeachMath
Use 16 different factors of 672 in a 4 by 4 grid. The numbers in the top row add to 14. The numbers in the second row add to 84. The numbers in the third row add to 92. The numbers in the bottom row add to 222. The numbers in the left column add to 262. The numbers in the second column add to 88. The numbers in the third column add to 24. The numbers in the right column add to 38. The central four cells contain triangle numbers.
January 16, 2026 at 11:46 AM
mikejacobs.bsky.social
Try this shady #yohaku. Fill in cells with 9 different integers to get products shown in each row/column AND sum of 4 shaded cells is -6. #mathsky #iTeachMath
Use 9 different integers in a 3 by 3 grid. The numbers in the top row multiply to 16. The numbers in the middle row multiply to -42. The numbers in the bottom row multiply to -1001. The numbers in the left column multiply to 264. The numbers in the middle column multiply to 98. The numbers in the right column multiply to 26. The sum of the integers in the 2 by 2 square at the top left of the grid is -6.
January 15, 2026 at 12:11 PM
mikejacobs.bsky.social
Start your day with this #yohaku. Fill in cells with 9 different factors of 336 to get totals shown in each row/column. #mathsky #iTeachMath
Use 9 different factors of 336 in a 3 by 3 grid. The numbers in the top row add to 25. The numbers in the middle row add to 51. The numbers in the bottom row add to 172. The numbers in the left column add to 7. The numbers in the middle column add to 66. The numbers in the right column add to 175.
January 14, 2026 at 12:16 PM
mikejacobs.bsky.social
"Start your day with this #yohaku. Fill in cells with 9 different whole numbers to get products shown in each row/column. More free puzzles and books/ebooks for all ages can be found at yohaku.ca
Use 9 different whole numbers in a 3 by 3 grid. The numbers in the top row multiply to 102. The numbers in the middle row multiply to 198. The numbers in the bottom row multiply to 364. The numbers in the left column multiply to 68. The numbers in the middle column multiply to 378. The numbers in the right column multiply to 286.
January 13, 2026 at 12:05 PM
mikejacobs.bsky.social
Start your week with this #yohaku. Fill in cells with 9 different factors of 224 to get totals shown in each row/column. #mathsky #iTeachMath
Use 9 different factors of 224 in a 3 by 3 grid. The numbers in the top row add to 26. The numbers in the middle row add to 39. The numbers in the bottom row add to 71. The numbers in the left column add to 13. The numbers in the middle column add to 86. The numbers in the right column add to 37.
January 12, 2026 at 11:46 AM
mikejacobs.bsky.social
Here's a #yohaku to take you into the weekend. Fill in cells with 16 different factors of 504 to get totals shown in each row/column AND shaded cells contain triangle numbers. #mathsky #iTeachMath
Use 16 different factors of 504 in a 4 by 4 grid. The numbers in the top row add to 10. The numbers in the second row add to 144. The numbers in the third row add to 123. The numbers in the bottom row add to 38. The numbers in the left column add to 44. The numbers in the second column add to 70. The numbers in the third column add to 51. The numbers in the right column add to 150. The central four cells contain triangle numbers.
January 9, 2026 at 11:52 AM
mikejacobs.bsky.social
Try this shady #yohaku. Fill in cells with 9 different integers to get products shown in each row/column AND sum of 4 shaded cells is 3. #mathsky #iTeachMath
Use 9 different integers in a 3 by 3 grid. The numbers in the top row multiply to -66. The numbers in the middle row multiply to 195. The numbers in the bottom row multiply to -42. The numbers in the left column multiply to 156. The numbers in the middle column multiply to 165. The numbers in the right column multiply to 21. The sum of the integers in the 2 by 2 square at the top left of the grid is 3.
January 8, 2026 at 11:44 AM
mikejacobs.bsky.social
Start your day with this #yohaku. Fill in cells with 9 different factors of 520 to get totals shown in each row/column. #mathsky #iTeachMath
Use 9 different factors of 520 in a 3 by 3 grid. The numbers in the top row add to 91. The numbers in the middle row add to 50. The numbers in the bottom row add to 118. The numbers in the left column add to 96. The numbers in the middle column add to 38. The numbers in the right column add to 125.
January 7, 2026 at 12:19 PM
mikejacobs.bsky.social
Start your day with this #yohaku. Fill in cells with 9 different whole numbers to get products shown in each row/column.
More free puzzles and books/ebooks for all ages can be found at yohaku.ca
#mathsky #iTeachMath
Use 9 different whole numbers in a 3 by 3 grid. The numbers in the top row multiply to 78. The numbers in the middle row multiply to 168. The numbers in the bottom row multiply to 165. The numbers in the left column multiply to 91. The numbers in the middle column multiply to 88. The numbers in the right column multiply to 270.
January 6, 2026 at 12:23 PM
mikejacobs.bsky.social
Start your week with this #yohaku. Fill in cells with 9 different factors of 490 to get totals shown in each row/column. #mathsky #iTeachMath
Use 9 different factors of 490 in a 3 by 3 grid. The numbers in the top row add to 42. The numbers in the middle row add to 113. The numbers in the bottom row add to 66. The numbers in the left column add to 85. The numbers in the middle column add to 29. The numbers in the right column add to 107.
January 5, 2026 at 12:13 PM
mikejacobs.bsky.social
Happy New Year everyone! Here's a special #yohaku to celebrate. Fill in cells with 16 different factors of 2600 to get totals shown in each row/column AND shaded cells contain square numbers.
Use 16 different factors of 2600 in a 4 by 4 grid. The numbers in the top row add to 388. The numbers in the second row add to 221. The numbers in the third row add to 101. The numbers in the bottom row add to 73. The numbers in the left column add to 36. The numbers in the second column add to 177. The numbers in the third column add to 199. The numbers in the right column add to 371. The central four cells contain square numbers.
January 1, 2026 at 2:49 PM
mikejacobs.bsky.social
Much as I love doing the Jumble each day, I think that there is a little math error in today's puzzle.
A Jumble puzzle that gives the answer 'In their prime' to the clue 'Numbers 1, 2, 3, 5 and 7 will never show signs of age and always be…'
December 26, 2025 at 2:36 PM
mikejacobs.bsky.social
Here's a special Christmas #yohaku! Fill in cells with 25 different factors of 840 to get totals shown in each row/column AND shaded cells contain triangle numbers.
Use 25 different factors of 840 in a 5 by 5 grid. The numbers in the top row add to 90. The numbers in the second row add to 17. The numbers in the third row add to 555. The numbers in the fourth row add to 206. The numbers in the bottom row add to 184. The numbers in the left column add to 35. The numbers in the second column add to 86. The numbers in the third column add to 621. The numbers in the fourth column add to 118. The numbers in the right column add to 192. The eight cells surrounding the central square contain triangle numbers.
December 25, 2025 at 4:19 AM