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Squaring 2-Digit Numbers Mentally Worksheet

Mental maths lesson 23: Square any 2-digit number: up and down · Set 387 · 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. 1.98² =
  2. 2.55² =
  3. 3.39² =
  4. 4.47² =
  5. 5.93² =
  6. 6.46² =
  7. 7.57² =
  8. 8.34² =
  9. 9.94² =
  10. 10.58² =
  11. 11.52² =
  12. 12.78² =
  13. 13.64² =
  14. 14.63² =
  15. 15.44² =
  16. 16.51² =
  17. 17.43² =
  18. 18.71² =
  19. 19.49² =
  20. 20.61² =
  21. 21.82² =
  22. 22.84² =
  23. 23.73² =
  24. 24.91² =
  25. 25.83² =
  26. 26.85² =
  27. 27.45² =
  28. 28.66² =
  29. 29.36² =
  30. 30.56² =
  31. 31.95² =
  32. 32.92² =
  33. 33.54² =
  34. 34.53² =
  35. 35.31² =
  36. 36.42² =
  37. 37.72² =
  38. 38.41² =
  39. 39.79² =
  40. 40.87² =

Answer key

  1. 9604
  2. 3025
  3. 1521
  4. 2209
  5. 8649
  6. 2116
  7. 3249
  8. 1156
  9. 8836
  10. 3364
  11. 2704
  12. 6084
  13. 4096
  14. 3969
  15. 1936
  16. 2601
  17. 1849
  18. 5041
  19. 2401
  20. 3721
  21. 6724
  22. 7056
  23. 5329
  24. 8281
  25. 6889
  26. 7225
  27. 2025
  28. 4356
  29. 1296
  30. 3136
  31. 9025
  32. 8464
  33. 2916
  34. 2809
  35. 961
  36. 1764
  37. 5184
  38. 1681
  39. 6241
  40. 7569

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