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Squaring 2-Digit Numbers Mentally Worksheet

Mental maths lesson 23: Square any 2-digit number: up and down · Set 162 · 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. 1.91² =
  2. 2.76² =
  3. 3.41² =
  4. 4.97² =
  5. 5.87² =
  6. 6.65² =
  7. 7.77² =
  8. 8.38² =
  9. 9.79² =
  10. 10.75² =
  11. 11.69² =
  12. 12.74² =
  13. 13.81² =
  14. 14.42² =
  15. 15.52² =
  16. 16.78² =
  17. 17.37² =
  18. 18.49² =
  19. 19.59² =
  20. 20.48² =
  21. 21.35² =
  22. 22.32² =
  23. 23.58² =
  24. 24.62² =
  25. 25.84² =
  26. 26.98² =
  27. 27.86² =
  28. 28.53² =
  29. 29.88² =
  30. 30.36² =
  31. 31.95² =
  32. 32.47² =
  33. 33.51² =
  34. 34.54² =
  35. 35.31² =
  36. 36.92² =
  37. 37.45² =
  38. 38.63² =
  39. 39.83² =
  40. 40.82² =

Answer key

  1. 8281
  2. 5776
  3. 1681
  4. 9409
  5. 7569
  6. 4225
  7. 5929
  8. 1444
  9. 6241
  10. 5625
  11. 4761
  12. 5476
  13. 6561
  14. 1764
  15. 2704
  16. 6084
  17. 1369
  18. 2401
  19. 3481
  20. 2304
  21. 1225
  22. 1024
  23. 3364
  24. 3844
  25. 7056
  26. 9604
  27. 7396
  28. 2809
  29. 7744
  30. 1296
  31. 9025
  32. 2209
  33. 2601
  34. 2916
  35. 961
  36. 8464
  37. 2025
  38. 3969
  39. 6889
  40. 6724

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