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Squaring 2-Digit Numbers Mentally Worksheet

Mental maths lesson 23: Square any 2-digit number: up and down · Set 726 · 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. 1.82² =
  2. 2.31² =
  3. 3.51² =
  4. 4.62² =
  5. 5.54² =
  6. 6.69² =
  7. 7.78² =
  8. 8.36² =
  9. 9.45² =
  10. 10.65² =
  11. 11.68² =
  12. 12.44² =
  13. 13.83² =
  14. 14.84² =
  15. 15.67² =
  16. 16.46² =
  17. 17.41² =
  18. 18.93² =
  19. 19.52² =
  20. 20.39² =
  21. 21.32² =
  22. 22.98² =
  23. 23.58² =
  24. 24.99² =
  25. 25.73² =
  26. 26.91² =
  27. 27.79² =
  28. 28.33² =
  29. 29.88² =
  30. 30.38² =
  31. 31.49² =
  32. 32.77² =
  33. 33.43² =
  34. 34.89² =
  35. 35.42² =
  36. 36.47² =
  37. 37.75² =
  38. 38.96² =
  39. 39.53² =
  40. 40.74² =

Answer key

  1. 6724
  2. 961
  3. 2601
  4. 3844
  5. 2916
  6. 4761
  7. 6084
  8. 1296
  9. 2025
  10. 4225
  11. 4624
  12. 1936
  13. 6889
  14. 7056
  15. 4489
  16. 2116
  17. 1681
  18. 8649
  19. 2704
  20. 1521
  21. 1024
  22. 9604
  23. 3364
  24. 9801
  25. 5329
  26. 8281
  27. 6241
  28. 1089
  29. 7744
  30. 1444
  31. 2401
  32. 5929
  33. 1849
  34. 7921
  35. 1764
  36. 2209
  37. 5625
  38. 9216
  39. 2809
  40. 5476

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