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Squaring 2-Digit Numbers Mentally Worksheet

Mental maths lesson 23: Square any 2-digit number: up and down · Set 703 · 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. 1.96² =
  2. 2.98² =
  3. 3.59² =
  4. 4.33² =
  5. 5.61² =
  6. 6.32² =
  7. 7.51² =
  8. 8.54² =
  9. 9.35² =
  10. 10.42² =
  11. 11.88² =
  12. 12.49² =
  13. 13.64² =
  14. 14.84² =
  15. 15.99² =
  16. 16.97² =
  17. 17.72² =
  18. 18.92² =
  19. 19.73² =
  20. 20.41² =
  21. 21.71² =
  22. 22.58² =
  23. 23.43² =
  24. 24.91² =
  25. 25.63² =
  26. 26.47² =
  27. 27.36² =
  28. 28.56² =
  29. 29.85² =
  30. 30.95² =
  31. 31.78² =
  32. 32.66² =
  33. 33.77² =
  34. 34.68² =
  35. 35.57² =
  36. 36.74² =
  37. 37.39² =
  38. 38.62² =
  39. 39.53² =
  40. 40.44² =

Answer key

  1. 9216
  2. 9604
  3. 3481
  4. 1089
  5. 3721
  6. 1024
  7. 2601
  8. 2916
  9. 1225
  10. 1764
  11. 7744
  12. 2401
  13. 4096
  14. 7056
  15. 9801
  16. 9409
  17. 5184
  18. 8464
  19. 5329
  20. 1681
  21. 5041
  22. 3364
  23. 1849
  24. 8281
  25. 3969
  26. 2209
  27. 1296
  28. 3136
  29. 7225
  30. 9025
  31. 6084
  32. 4356
  33. 5929
  34. 4624
  35. 3249
  36. 5476
  37. 1521
  38. 3844
  39. 2809
  40. 1936

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