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Squaring 2-Digit Numbers Mentally Worksheet

Mental maths lesson 23: Square any 2-digit number: up and down · Set 70 · 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. 1.36² =
  2. 2.45² =
  3. 3.77² =
  4. 4.41² =
  5. 5.88² =
  6. 6.98² =
  7. 7.53² =
  8. 8.58² =
  9. 9.38² =
  10. 10.75² =
  11. 11.64² =
  12. 12.91² =
  13. 13.44² =
  14. 14.73² =
  15. 15.57² =
  16. 16.43² =
  17. 17.52² =
  18. 18.69² =
  19. 19.95² =
  20. 20.47² =
  21. 21.71² =
  22. 22.83² =
  23. 23.78² =
  24. 24.49² =
  25. 25.85² =
  26. 26.33² =
  27. 27.86² =
  28. 28.93² =
  29. 29.67² =
  30. 30.31² =
  31. 31.66² =
  32. 32.51² =
  33. 33.92² =
  34. 34.42² =
  35. 35.32² =
  36. 36.34² =
  37. 37.94² =
  38. 38.63² =
  39. 39.79² =
  40. 40.81² =

Answer key

  1. 1296
  2. 2025
  3. 5929
  4. 1681
  5. 7744
  6. 9604
  7. 2809
  8. 3364
  9. 1444
  10. 5625
  11. 4096
  12. 8281
  13. 1936
  14. 5329
  15. 3249
  16. 1849
  17. 2704
  18. 4761
  19. 9025
  20. 2209
  21. 5041
  22. 6889
  23. 6084
  24. 2401
  25. 7225
  26. 1089
  27. 7396
  28. 8649
  29. 4489
  30. 961
  31. 4356
  32. 2601
  33. 8464
  34. 1764
  35. 1024
  36. 1156
  37. 8836
  38. 3969
  39. 6241
  40. 6561

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