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Squaring 2-Digit Numbers Mentally Worksheet

Mental maths lesson 23: Square any 2-digit number: up and down · Set 20 · 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. 2.48² =
  3. 3.69² =
  4. 4.55² =
  5. 5.72² =
  6. 6.42² =
  7. 7.68² =
  8. 8.71² =
  9. 9.45² =
  10. 10.73² =
  11. 11.49² =
  12. 12.84² =
  13. 13.54² =
  14. 14.41² =
  15. 15.38² =
  16. 16.32² =
  17. 17.79² =
  18. 18.58² =
  19. 19.87² =
  20. 20.97² =
  21. 21.83² =
  22. 22.34² =
  23. 23.35² =
  24. 24.61² =
  25. 25.78² =
  26. 26.95² =
  27. 27.63² =
  28. 28.82² =
  29. 29.62² =
  30. 30.96² =
  31. 31.57² =
  32. 32.51² =
  33. 33.88² =
  34. 34.36² =
  35. 35.66² =
  36. 36.92² =
  37. 37.53² =
  38. 38.31² =
  39. 39.76² =
  40. 40.81² =

Answer key

  1. 8649
  2. 2304
  3. 4761
  4. 3025
  5. 5184
  6. 1764
  7. 4624
  8. 5041
  9. 2025
  10. 5329
  11. 2401
  12. 7056
  13. 2916
  14. 1681
  15. 1444
  16. 1024
  17. 6241
  18. 3364
  19. 7569
  20. 9409
  21. 6889
  22. 1156
  23. 1225
  24. 3721
  25. 6084
  26. 9025
  27. 3969
  28. 6724
  29. 3844
  30. 9216
  31. 3249
  32. 2601
  33. 7744
  34. 1296
  35. 4356
  36. 8464
  37. 2809
  38. 961
  39. 5776
  40. 6561

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