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Squaring 2-Digit Numbers Mentally Worksheet

Mental maths lesson 23: Square any 2-digit number: up and down · Set 460 · 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. 1.85² =
  2. 2.89² =
  3. 3.31² =
  4. 4.94² =
  5. 5.41² =
  6. 6.32² =
  7. 7.55² =
  8. 8.42² =
  9. 9.34² =
  10. 10.35² =
  11. 11.99² =
  12. 12.98² =
  13. 13.97² =
  14. 14.45² =
  15. 15.61² =
  16. 16.75² =
  17. 17.92² =
  18. 18.72² =
  19. 19.47² =
  20. 20.53² =
  21. 21.64² =
  22. 22.37² =
  23. 23.51² =
  24. 24.36² =
  25. 25.52² =
  26. 26.77² =
  27. 27.91² =
  28. 28.63² =
  29. 29.59² =
  30. 30.56² =
  31. 31.58² =
  32. 32.71² =
  33. 33.81² =
  34. 34.39² =
  35. 35.72² =
  36. 36.84² =
  37. 37.88² =
  38. 38.43² =
  39. 39.93² =
  40. 40.82² =

Answer key

  1. 7225
  2. 7921
  3. 961
  4. 8836
  5. 1681
  6. 1024
  7. 3025
  8. 1764
  9. 1156
  10. 1225
  11. 9801
  12. 9604
  13. 9409
  14. 2025
  15. 3721
  16. 5625
  17. 8464
  18. 5184
  19. 2209
  20. 2809
  21. 4096
  22. 1369
  23. 2601
  24. 1296
  25. 2704
  26. 5929
  27. 8281
  28. 3969
  29. 3481
  30. 3136
  31. 3364
  32. 5041
  33. 6561
  34. 1521
  35. 5184
  36. 7056
  37. 7744
  38. 1849
  39. 8649
  40. 6724

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