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Squaring 2-Digit Numbers Mentally Worksheet

Mental maths lesson 23: Square any 2-digit number: up and down · Set 67 · 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. 1.93² =
  2. 2.47² =
  3. 3.82² =
  4. 4.51² =
  5. 5.42² =
  6. 6.73² =
  7. 7.66² =
  8. 8.92² =
  9. 9.55² =
  10. 10.58² =
  11. 11.78² =
  12. 12.59² =
  13. 13.34² =
  14. 14.61² =
  15. 15.41² =
  16. 16.69² =
  17. 17.91² =
  18. 18.74² =
  19. 19.45² =
  20. 20.77² =
  21. 21.81² =
  22. 22.32² =
  23. 23.54² =
  24. 24.71² =
  25. 25.35² =
  26. 26.33² =
  27. 27.95² =
  28. 28.39² =
  29. 29.64² =
  30. 30.97² =
  31. 31.89² =
  32. 32.63² =
  33. 33.65² =
  34. 34.46² =
  35. 35.43² =
  36. 36.53² =
  37. 37.87² =
  38. 38.79² =
  39. 39.49² =
  40. 40.44² =

Answer key

  1. 8649
  2. 2209
  3. 6724
  4. 2601
  5. 1764
  6. 5329
  7. 4356
  8. 8464
  9. 3025
  10. 3364
  11. 6084
  12. 3481
  13. 1156
  14. 3721
  15. 1681
  16. 4761
  17. 8281
  18. 5476
  19. 2025
  20. 5929
  21. 6561
  22. 1024
  23. 2916
  24. 5041
  25. 1225
  26. 1089
  27. 9025
  28. 1521
  29. 4096
  30. 9409
  31. 7921
  32. 3969
  33. 4225
  34. 2116
  35. 1849
  36. 2809
  37. 7569
  38. 6241
  39. 2401
  40. 1936

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