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Squaring 2-Digit Numbers Mentally Worksheet

Mental maths lesson 23: Square any 2-digit number: up and down · Set 13 · 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. 1.99² =
  2. 2.88² =
  3. 3.41² =
  4. 4.43² =
  5. 5.38² =
  6. 6.31² =
  7. 7.35² =
  8. 8.87² =
  9. 9.49² =
  10. 10.97² =
  11. 11.59² =
  12. 12.81² =
  13. 13.95² =
  14. 14.61² =
  15. 15.65² =
  16. 16.34² =
  17. 17.69² =
  18. 18.72² =
  19. 19.42² =
  20. 20.86² =
  21. 21.78² =
  22. 22.51² =
  23. 23.79² =
  24. 24.45² =
  25. 25.36² =
  26. 26.91² =
  27. 27.71² =
  28. 28.54² =
  29. 29.82² =
  30. 30.63² =
  31. 31.77² =
  32. 32.44² =
  33. 33.93² =
  34. 34.56² =
  35. 35.33² =
  36. 36.66² =
  37. 37.75² =
  38. 38.62² =
  39. 39.85² =
  40. 40.52² =

Answer key

  1. 9801
  2. 7744
  3. 1681
  4. 1849
  5. 1444
  6. 961
  7. 1225
  8. 7569
  9. 2401
  10. 9409
  11. 3481
  12. 6561
  13. 9025
  14. 3721
  15. 4225
  16. 1156
  17. 4761
  18. 5184
  19. 1764
  20. 7396
  21. 6084
  22. 2601
  23. 6241
  24. 2025
  25. 1296
  26. 8281
  27. 5041
  28. 2916
  29. 6724
  30. 3969
  31. 5929
  32. 1936
  33. 8649
  34. 3136
  35. 1089
  36. 4356
  37. 5625
  38. 3844
  39. 7225
  40. 2704

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