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Squaring 2-Digit Numbers Mentally Worksheet

Mental maths lesson 23: Square any 2-digit number: up and down · Set 820 · 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. 2.81² =
  3. 3.62² =
  4. 4.53² =
  5. 5.63² =
  6. 6.75² =
  7. 7.96² =
  8. 8.58² =
  9. 9.67² =
  10. 10.59² =
  11. 11.42² =
  12. 12.74² =
  13. 13.47² =
  14. 14.35² =
  15. 15.93² =
  16. 16.76² =
  17. 17.49² =
  18. 18.72² =
  19. 19.51² =
  20. 20.39² =
  21. 21.46² =
  22. 22.87² =
  23. 23.71² =
  24. 24.99² =
  25. 25.85² =
  26. 26.66² =
  27. 27.44² =
  28. 28.38² =
  29. 29.64² =
  30. 30.79² =
  31. 31.91² =
  32. 32.54² =
  33. 33.82² =
  34. 34.34² =
  35. 35.36² =
  36. 36.33² =
  37. 37.77² =
  38. 38.55² =
  39. 39.41² =
  40. 40.88² =

Answer key

  1. 1024
  2. 6561
  3. 3844
  4. 2809
  5. 3969
  6. 5625
  7. 9216
  8. 3364
  9. 4489
  10. 3481
  11. 1764
  12. 5476
  13. 2209
  14. 1225
  15. 8649
  16. 5776
  17. 2401
  18. 5184
  19. 2601
  20. 1521
  21. 2116
  22. 7569
  23. 5041
  24. 9801
  25. 7225
  26. 4356
  27. 1936
  28. 1444
  29. 4096
  30. 6241
  31. 8281
  32. 2916
  33. 6724
  34. 1156
  35. 1296
  36. 1089
  37. 5929
  38. 3025
  39. 1681
  40. 7744

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