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Mike Jacobs

@mikejacobs.bsky.social

450 followers 42 following 500 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

www.yohaku.ca

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Mike Jacobs @mikejacobs.bsky.social · 10h

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 1. #mathsky #iTeachMath

Use 9 different integers in a 3 by 3 grid. The numbers in the top row multiply to 126. The numbers in the middle row multiply to 32. The numbers in the bottom row multiply to -165. The numbers in the left column multiply to -27. The numbers in the middle column multiply to -560. The numbers in the right column multiply to -44. The sum of the integers in the 2 by 2 square at the top left of the grid is 1.

Mike Jacobs @mikejacobs.bsky.social · 1d

Start your day with this #yohaku. Fill in cells with 9 different factors of 495 to get totals shown in each row/column. #mathsky #iTeachMath

Use 9 different factors of 495 in a 3 by 3 grid. The numbers in the top row add to 213. The numbers in the middle row add to 65. The numbers in the bottom row add to 31. The numbers in the left column add to 15. The numbers in the middle column add to 69. The numbers in the right column add to 225.

Mike Jacobs @mikejacobs.bsky.social · 2d

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 297. The numbers in the middle row multiply to 42. The numbers in the bottom row multiply to 64. The numbers in the left column multiply to 22. The numbers in the middle column multiply to 432. The numbers in the right column multiply to 84.

Mike Jacobs @mikejacobs.bsky.social · 3d

Start your week with this #yohaku. Fill in cells with 9 different factors of 198 to get totals shown in each row/column. #mathsky #iTeachMath

Use 9 different factors of 198 in a 3 by 3 grid. The numbers in the top row add to 39. The numbers in the middle row add to 119. The numbers in the bottom row add to 13. The numbers in the left column add to 14. The numbers in the middle column add to 33. The numbers in the right column add to 124.

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Mike Jacobs @mikejacobs.bsky.social · 3d

Lots of salmon seen swimming up creek on my trail run today. I marvel at this sight every autumn.

Mike Jacobs @mikejacobs.bsky.social · 6d

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 square numbers. #mathsky #iTeachMath

Use 16 different factors of 540 in a 4 by 4 grid. The numbers in the top row add to 20. The numbers in the second row add to 82. The numbers in the third row add to 145. The numbers in the bottom row add to 65. The numbers in the left column add to 176. The numbers in the second column add to 18. The numbers in the third column add to 70. The numbers in the right column add to 48. The central four cells contain square numbers.

Mike Jacobs @mikejacobs.bsky.social · 7d

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 -1. #mathsky #iTeachMath

Use 9 different integers in a 3 by 3 grid. The numbers in the top row multiply to -57. The numbers in the middle row multiply to -104. The numbers in the bottom row multiply to 140. The numbers in the left column multiply to 273. The numbers in the middle column multiply to -380. The numbers in the right column multiply to -8. The sum of the integers in the 2 by 2 square at the top left of the grid is -1.

Mike Jacobs @mikejacobs.bsky.social · 8d

Start your day with this #yohaku. Fill in cells with 9 different factors of 156 to get totals shown in each row/column. #mathsky #iTeachMath

Use 9 different factors of 156 in a 3 by 3 grid. The numbers in the top row add to 21. The numbers in the middle row add to 172. The numbers in the bottom row add to 30. The numbers in the left column add to 170. The numbers in the middle column add to 40. The numbers in the right column add to 13.

Mike Jacobs @mikejacobs.bsky.social · 9d

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 231. The numbers in the middle row multiply to 130. The numbers in the bottom row multiply to 60. The numbers in the left column multiply to 42. The numbers in the middle column multiply to 195. The numbers in the right column multiply to 220.

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Mike Jacobs @mikejacobs.bsky.social · 10d

Start your week with this #yohaku. Fill in cells with 9 different factors of 168 to get totals shown in each row/column. #mathsky #iTeachMath

Use 9 different factors of 168 in a 3 by 3 grid. The numbers in the top row add to 192. The numbers in the middle row add to 27. The numbers in the bottom row add to 31. The numbers in the left column add to 11. The numbers in the middle column add to 61. The numbers in the right column add to 178.

Mike Jacobs @mikejacobs.bsky.social · 13d

Here's a #yohaku to take you into the weekend. Fill in cells with 16 different factors of 480 to get totals shown in each row/column AND shaded cells contain triangle numbers. #mathsky #iTeachMath

Use 16 different factors of 480 in a 4 by 4 grid. The numbers in the top row add to 332. The numbers in the second row add to 65. The numbers in the third row add to 37. The numbers in the bottom row add to 12. The numbers in the left column add to 44. The numbers in the second column add to 75. The numbers in the third column add to 42. The numbers in the right column add to 285. The central four cells contain triangle numbers.

Mike Jacobs @mikejacobs.bsky.social · 14d

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 -2. #mathsky #iTeachMath

Use 9 different integers in a 3 by 3 grid. The numbers in the top row multiply to -84. The numbers in the middle row multiply to -495. The numbers in the bottom row multiply to -16. The numbers in the left column multiply to 70. The numbers in the middle column multiply to 264. The numbers in the right column multiply to -36. The sum of the integers in the 2 by 2 square at the top left of the grid is -2.

Mike Jacobs @mikejacobs.bsky.social · 15d

Start your day with this #yohaku. Fill in cells with 9 different factors of 580 to get totals shown in each row/column. #mathsky #iTeachMath

Use 9 different factors of 580 in a 3 by 3 grid. The numbers in the top row add to 54. The numbers in the middle row add to 63. The numbers in the bottom row add to 128. The numbers in the left column add to 88. The numbers in the middle column add to 35. The numbers in the right column add to 122.

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Mike Jacobs @mikejacobs.bsky.social · 20d

Here's a #yohaku to take you into the weekend. Fill in cells with 16 different factors of 252 to get totals shown in each row/column AND shaded cells contain triangle numbers. #mathsky #iTeachMath

Use 16 different factors of 252 in a 4 by 4 grid. The numbers in the top row add to 333. The numbers in the second row add to 94. The numbers in the third row add to 78. The numbers in the bottom row add to 13. The numbers in the left column add to 26. The numbers in the second column add to 127. The numbers in the third column add to 51. The numbers in the right column add to 314. The central four cells contain triangle numbers.

Mike Jacobs @mikejacobs.bsky.social · 21d

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 -2. #mathsky #iTeachMath

Use 9 different integers in a 3 by 3 grid. The numbers in the top row multiply to -42. The numbers in the middle row multiply to 8. The numbers in the bottom row multiply to 130. The numbers in the left column multiply to -28. The numbers in the middle column multiply to 30. The numbers in the right column multiply to 52. The sum of the integers in the 2 by 2 square at the top left of the grid is -2.

Mike Jacobs @mikejacobs.bsky.social · 22d

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 116. The numbers in the middle row add to 32. The numbers in the bottom row add to 77. The numbers in the left column add to 76. The numbers in the middle column add to 113. The numbers in the right column add to 36.

Mike Jacobs @mikejacobs.bsky.social · 23d

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 468. The numbers in the middle row multiply to 28. The numbers in the bottom row multiply to 165. The numbers in the left column multiply to 260. The numbers in the middle column multiply to 54. The numbers in the right column multiply to 154.

Mike Jacobs @mikejacobs.bsky.social · 24d

Start your week with this #yohaku. Fill in cells with 9 different factors of 140 to get totals shown in each row/column. #mathsky #iTeachMath

Use 9 different factors of 140 in a 3 by 3 grid. The numbers in the top row add to 19. The numbers in the middle row add to 32. The numbers in the bottom row add to 152. The numbers in the left column add to 11. The numbers in the middle column add to 41. The numbers in the right column add to 151.

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Mike Jacobs @mikejacobs.bsky.social · 28d

Thanks for letting me know. It should be working now.

Mike Jacobs @mikejacobs.bsky.social · 28d

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 1. #mathsky #iTeachMath

Use 9 different integers in a 3 by 3 grid. The numbers in the top row multiply to -102. The numbers in the middle row multiply to -45. The numbers in the bottom row multiply to -84. The numbers in the left column multiply to -170. The numbers in the middle column multiply to 126. The numbers in the right column multiply to 18. The sum of the integers in the 2 by 2 square at the top left of the grid is 1.

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Mike Jacobs @mikejacobs.bsky.social · 29d

Start your day with this #yohaku. Fill in cells with 9 different factors of 570 to get totals shown in each row/column. #mathsky #iTeachMath

Use 9 different factors of 570 in a 3 by 3 grid. The numbers in the top row add to 117. The numbers in the middle row add to 18. The numbers in the bottom row add to 21. The numbers in the left column add to 9. The numbers in the middle column add to 31. The numbers in the right column add to 116.

Mike Jacobs @mikejacobs.bsky.social · Sep 9

"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 128. The numbers in the middle row multiply to 330. The numbers in the bottom row multiply to 27. The numbers in the left column multiply to 12. The numbers in the middle column multiply to 396. The numbers in the right column multiply to 240.

Mike Jacobs @mikejacobs.bsky.social · Sep 8

Start your week with this #yohaku. Fill in cells with 9 different factors of 340 to get totals shown in each row/column. #mathsky #iTeachMath

Use 9 different factors of 340 in a 3 by 3 grid. The numbers in the top row add to 16. The numbers in the middle row add to 104. The numbers in the bottom row add to 106. The numbers in the left column add to 43. The numbers in the middle column add to 88. The numbers in the right column add to 95.

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Mike Jacobs @mikejacobs.bsky.social · Sep 5

Here's a #yohaku to take you into the weekend. Fill in cells with 16 different factors of 252 to get totals shown in each row/column AND shaded cells contain triangle numbers.
#mathsky #iTeachMath

Use 16 different factors of 252 in a 4 by 4 grid. The numbers in the top row add to 14. The numbers in the second row add to 54. The numbers in the third row add to 132. The numbers in the bottom row add to 213. The numbers in the left column add to 36. The numbers in the second column add to 49. The numbers in the third column add to 98. The numbers in the right column add to 230. The central four cells contain triangle numbers.

Mike Jacobs @mikejacobs.bsky.social · Sep 4

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 .
#mathsky #iTeachMath

Use 9 different integers in a 3 by 3 grid. The numbers in the top row multiply to -91. The numbers in the middle row multiply to 156. The numbers in the bottom row multiply to -120. The numbers in the left column multiply to -390. The numbers in the middle column multiply to 16. The numbers in the right column multiply to -273. The sum of the integers in the 2 by 2 square at the top left of the grid is -4.