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Squaring 2-Digit Numbers Mentally Worksheet

Mental maths lesson 23: Square any 2-digit number: up and down · Set 120 · 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. 1.65² =
  2. 2.91² =
  3. 3.55² =
  4. 4.47² =
  5. 5.44² =
  6. 6.86² =
  7. 7.83² =
  8. 8.73² =
  9. 9.58² =
  10. 10.54² =
  11. 11.49² =
  12. 12.48² =
  13. 13.41² =
  14. 14.76² =
  15. 15.84² =
  16. 16.71² =
  17. 17.45² =
  18. 18.99² =
  19. 19.46² =
  20. 20.95² =
  21. 21.42² =
  22. 22.72² =
  23. 23.98² =
  24. 24.69² =
  25. 25.51² =
  26. 26.74² =
  27. 27.61² =
  28. 28.81² =
  29. 29.37² =
  30. 30.31² =
  31. 31.78² =
  32. 32.63² =
  33. 33.93² =
  34. 34.79² =
  35. 35.52² =
  36. 36.36² =
  37. 37.85² =
  38. 38.82² =
  39. 39.87² =
  40. 40.33² =

Answer key

  1. 4225
  2. 8281
  3. 3025
  4. 2209
  5. 1936
  6. 7396
  7. 6889
  8. 5329
  9. 3364
  10. 2916
  11. 2401
  12. 2304
  13. 1681
  14. 5776
  15. 7056
  16. 5041
  17. 2025
  18. 9801
  19. 2116
  20. 9025
  21. 1764
  22. 5184
  23. 9604
  24. 4761
  25. 2601
  26. 5476
  27. 3721
  28. 6561
  29. 1369
  30. 961
  31. 6084
  32. 3969
  33. 8649
  34. 6241
  35. 2704
  36. 1296
  37. 7225
  38. 6724
  39. 7569
  40. 1089

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