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Squaring 2-Digit Numbers Mentally Worksheet

Mental maths lesson 23: Square any 2-digit number: up and down · Set 173 · 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. 1.55² =
  2. 2.32² =
  3. 3.34² =
  4. 4.39² =
  5. 5.99² =
  6. 6.67² =
  7. 7.45² =
  8. 8.59² =
  9. 9.44² =
  10. 10.93² =
  11. 11.81² =
  12. 12.49² =
  13. 13.36² =
  14. 14.88² =
  15. 15.58² =
  16. 16.72² =
  17. 17.69² =
  18. 18.82² =
  19. 19.77² =
  20. 20.76² =
  21. 21.37² =
  22. 22.33² =
  23. 23.83² =
  24. 24.78² =
  25. 25.51² =
  26. 26.48² =
  27. 27.61² =
  28. 28.43² =
  29. 29.95² =
  30. 30.42² =
  31. 31.35² =
  32. 32.79² =
  33. 33.68² =
  34. 34.85² =
  35. 35.41² =
  36. 36.91² =
  37. 37.87² =
  38. 38.64² =
  39. 39.92² =
  40. 40.53² =

Answer key

  1. 3025
  2. 1024
  3. 1156
  4. 1521
  5. 9801
  6. 4489
  7. 2025
  8. 3481
  9. 1936
  10. 8649
  11. 6561
  12. 2401
  13. 1296
  14. 7744
  15. 3364
  16. 5184
  17. 4761
  18. 6724
  19. 5929
  20. 5776
  21. 1369
  22. 1089
  23. 6889
  24. 6084
  25. 2601
  26. 2304
  27. 3721
  28. 1849
  29. 9025
  30. 1764
  31. 1225
  32. 6241
  33. 4624
  34. 7225
  35. 1681
  36. 8281
  37. 7569
  38. 4096
  39. 8464
  40. 2809

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