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Squaring 2-Digit Numbers Mentally Worksheet

Mental maths lesson 23: Square any 2-digit number: up and down · Set 231 · 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. 2.33² =
  3. 3.65² =
  4. 4.44² =
  5. 5.77² =
  6. 6.61² =
  7. 7.54² =
  8. 8.79² =
  9. 9.88² =
  10. 10.34² =
  11. 11.76² =
  12. 12.46² =
  13. 13.35² =
  14. 14.82² =
  15. 15.36² =
  16. 16.81² =
  17. 17.92² =
  18. 18.38² =
  19. 19.52² =
  20. 20.41² =
  21. 21.31² =
  22. 22.67² =
  23. 23.99² =
  24. 24.51² =
  25. 25.96² =
  26. 26.74² =
  27. 27.59² =
  28. 28.55² =
  29. 29.47² =
  30. 30.32² =
  31. 31.87² =
  32. 32.69² =
  33. 33.89² =
  34. 34.48² =
  35. 35.97² =
  36. 36.62² =
  37. 37.93² =
  38. 38.49² =
  39. 39.45² =
  40. 40.58² =

Answer key

  1. 7225
  2. 1089
  3. 4225
  4. 1936
  5. 5929
  6. 3721
  7. 2916
  8. 6241
  9. 7744
  10. 1156
  11. 5776
  12. 2116
  13. 1225
  14. 6724
  15. 1296
  16. 6561
  17. 8464
  18. 1444
  19. 2704
  20. 1681
  21. 961
  22. 4489
  23. 9801
  24. 2601
  25. 9216
  26. 5476
  27. 3481
  28. 3025
  29. 2209
  30. 1024
  31. 7569
  32. 4761
  33. 7921
  34. 2304
  35. 9409
  36. 3844
  37. 8649
  38. 2401
  39. 2025
  40. 3364

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