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Squaring 2-Digit Numbers Mentally Worksheet

Mental maths lesson 23: Square any 2-digit number: up and down · Set 824 · 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. 2.62² =
  3. 3.33² =
  4. 4.88² =
  5. 5.67² =
  6. 6.93² =
  7. 7.36² =
  8. 8.82² =
  9. 9.91² =
  10. 10.63² =
  11. 11.52² =
  12. 12.31² =
  13. 13.38² =
  14. 14.97² =
  15. 15.48² =
  16. 16.87² =
  17. 17.71² =
  18. 18.49² =
  19. 19.58² =
  20. 20.85² =
  21. 21.76² =
  22. 22.96² =
  23. 23.41² =
  24. 24.47² =
  25. 25.81² =
  26. 26.55² =
  27. 27.83² =
  28. 28.66² =
  29. 29.74² =
  30. 30.54² =
  31. 31.84² =
  32. 32.44² =
  33. 33.78² =
  34. 34.99² =
  35. 35.37² =
  36. 36.42² =
  37. 37.89² =
  38. 38.92² =
  39. 39.95² =
  40. 40.98² =

Answer key

  1. 1156
  2. 3844
  3. 1089
  4. 7744
  5. 4489
  6. 8649
  7. 1296
  8. 6724
  9. 8281
  10. 3969
  11. 2704
  12. 961
  13. 1444
  14. 9409
  15. 2304
  16. 7569
  17. 5041
  18. 2401
  19. 3364
  20. 7225
  21. 5776
  22. 9216
  23. 1681
  24. 2209
  25. 6561
  26. 3025
  27. 6889
  28. 4356
  29. 5476
  30. 2916
  31. 7056
  32. 1936
  33. 6084
  34. 9801
  35. 1369
  36. 1764
  37. 7921
  38. 8464
  39. 9025
  40. 9604

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