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Squaring 2-Digit Numbers Mentally Worksheet

Mental maths lesson 23: Square any 2-digit number: up and down · Set 511 · 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. 1.41² =
  2. 2.62² =
  3. 3.54² =
  4. 4.52² =
  5. 5.76² =
  6. 6.32² =
  7. 7.69² =
  8. 8.53² =
  9. 9.36² =
  10. 10.42² =
  11. 11.43² =
  12. 12.88² =
  13. 13.39² =
  14. 14.45² =
  15. 15.84² =
  16. 16.85² =
  17. 17.79² =
  18. 18.77² =
  19. 19.81² =
  20. 20.34² =
  21. 21.86² =
  22. 22.51² =
  23. 23.95² =
  24. 24.37² =
  25. 25.98² =
  26. 26.99² =
  27. 27.78² =
  28. 28.44² =
  29. 29.64² =
  30. 30.63² =
  31. 31.38² =
  32. 32.75² =
  33. 33.91² =
  34. 34.49² =
  35. 35.33² =
  36. 36.67² =
  37. 37.96² =
  38. 38.31² =
  39. 39.73² =
  40. 40.74² =

Answer key

  1. 1681
  2. 3844
  3. 2916
  4. 2704
  5. 5776
  6. 1024
  7. 4761
  8. 2809
  9. 1296
  10. 1764
  11. 1849
  12. 7744
  13. 1521
  14. 2025
  15. 7056
  16. 7225
  17. 6241
  18. 5929
  19. 6561
  20. 1156
  21. 7396
  22. 2601
  23. 9025
  24. 1369
  25. 9604
  26. 9801
  27. 6084
  28. 1936
  29. 4096
  30. 3969
  31. 1444
  32. 5625
  33. 8281
  34. 2401
  35. 1089
  36. 4489
  37. 9216
  38. 961
  39. 5329
  40. 5476

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