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Squaring 2-Digit Numbers Mentally Worksheet

Mental maths lesson 23: Square any 2-digit number: up and down · Set 183 · 40 questions
TalentJR

How to do it in your head (Up and down): Find how far the number is from the nearest ten (the distance). Go that distance up and the same distance down, and multiply the two new numbers. Add the distance squared.

NameDateTime takenScore ___ / 40
  1. 1.95² =
  2. 2.37² =
  3. 3.41² =
  4. 4.51² =
  5. 5.86² =
  6. 6.38² =
  7. 7.31² =
  8. 8.67² =
  9. 9.44² =
  10. 10.79² =
  11. 11.46² =
  12. 12.63² =
  13. 13.58² =
  14. 14.61² =
  15. 15.75² =
  16. 16.57² =
  17. 17.82² =
  18. 18.47² =
  19. 19.93² =
  20. 20.35² =
  21. 21.66² =
  22. 22.53² =
  23. 23.62² =
  24. 24.78² =
  25. 25.92² =
  26. 26.72² =
  27. 27.89² =
  28. 28.49² =
  29. 29.98² =
  30. 30.99² =
  31. 31.71² =
  32. 32.94² =
  33. 33.81² =
  34. 34.65² =
  35. 35.81² =
  36. 36.52² =
  37. 37.64² =
  38. 38.59² =
  39. 39.91² =
  40. 40.32² =

Answer key

  1. 9025
  2. 1369
  3. 1681
  4. 2601
  5. 7396
  6. 1444
  7. 961
  8. 4489
  9. 1936
  10. 6241
  11. 2116
  12. 3969
  13. 3364
  14. 3721
  15. 5625
  16. 3249
  17. 6724
  18. 2209
  19. 8649
  20. 1225
  21. 4356
  22. 2809
  23. 3844
  24. 6084
  25. 8464
  26. 5184
  27. 7921
  28. 2401
  29. 9604
  30. 9801
  31. 5041
  32. 8836
  33. 6561
  34. 4225
  35. 6561
  36. 2704
  37. 4096
  38. 3481
  39. 8281
  40. 1024

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