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Squaring 2-Digit Numbers Mentally Worksheet

Mental maths lesson 23: Square any 2-digit number: up and down · Set 356 · 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. 1.34² =
  2. 2.38² =
  3. 3.46² =
  4. 4.93² =
  5. 5.43² =
  6. 6.59² =
  7. 7.99² =
  8. 8.54² =
  9. 9.82² =
  10. 10.95² =
  11. 11.77² =
  12. 12.33² =
  13. 13.91² =
  14. 14.65² =
  15. 15.98² =
  16. 16.64² =
  17. 17.76² =
  18. 18.68² =
  19. 19.62² =
  20. 20.52² =
  21. 21.32² =
  22. 22.72² =
  23. 23.49² =
  24. 24.81² =
  25. 25.55² =
  26. 26.51² =
  27. 27.58² =
  28. 28.57² =
  29. 29.41² =
  30. 30.92² =
  31. 31.89² =
  32. 32.73² =
  33. 33.87² =
  34. 34.63² =
  35. 35.66² =
  36. 36.61² =
  37. 37.67² =
  38. 38.79² =
  39. 39.31² =
  40. 40.96² =

Answer key

  1. 1156
  2. 1444
  3. 2116
  4. 8649
  5. 1849
  6. 3481
  7. 9801
  8. 2916
  9. 6724
  10. 9025
  11. 5929
  12. 1089
  13. 8281
  14. 4225
  15. 9604
  16. 4096
  17. 5776
  18. 4624
  19. 3844
  20. 2704
  21. 1024
  22. 5184
  23. 2401
  24. 6561
  25. 3025
  26. 2601
  27. 3364
  28. 3249
  29. 1681
  30. 8464
  31. 7921
  32. 5329
  33. 7569
  34. 3969
  35. 4356
  36. 3721
  37. 4489
  38. 6241
  39. 961
  40. 9216

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