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Squaring 2-Digit Numbers Mentally Worksheet

Mental maths lesson 23: Square any 2-digit number: up and down · Set 218 · 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. 1.32² =
  2. 2.82² =
  3. 3.91² =
  4. 4.81² =
  5. 5.67² =
  6. 6.85² =
  7. 7.83² =
  8. 8.33² =
  9. 9.77² =
  10. 10.49² =
  11. 11.59² =
  12. 12.41² =
  13. 13.71² =
  14. 14.68² =
  15. 15.42² =
  16. 16.63² =
  17. 17.78² =
  18. 18.73² =
  19. 19.58² =
  20. 20.31² =
  21. 21.52² =
  22. 22.96² =
  23. 23.89² =
  24. 24.88² =
  25. 25.48² =
  26. 26.93² =
  27. 27.95² =
  28. 28.38² =
  29. 29.87² =
  30. 30.37² =
  31. 31.99² =
  32. 32.39² =
  33. 33.72² =
  34. 34.47² =
  35. 35.57² =
  36. 36.84² =
  37. 37.46² =
  38. 38.43² =
  39. 39.54² =
  40. 40.92² =

Answer key

  1. 1024
  2. 6724
  3. 8281
  4. 6561
  5. 4489
  6. 7225
  7. 6889
  8. 1089
  9. 5929
  10. 2401
  11. 3481
  12. 1681
  13. 5041
  14. 4624
  15. 1764
  16. 3969
  17. 6084
  18. 5329
  19. 3364
  20. 961
  21. 2704
  22. 9216
  23. 7921
  24. 7744
  25. 2304
  26. 8649
  27. 9025
  28. 1444
  29. 7569
  30. 1369
  31. 9801
  32. 1521
  33. 5184
  34. 2209
  35. 3249
  36. 7056
  37. 2116
  38. 1849
  39. 2916
  40. 8464

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