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Squaring 2-Digit Numbers Mentally Worksheet

Mental maths lesson 23: Square any 2-digit number: up and down · Set 764 · 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. 1.62² =
  2. 2.45² =
  3. 3.87² =
  4. 4.93² =
  5. 5.78² =
  6. 6.33² =
  7. 7.46² =
  8. 8.51² =
  9. 9.67² =
  10. 10.48² =
  11. 11.66² =
  12. 12.37² =
  13. 13.83² =
  14. 14.63² =
  15. 15.91² =
  16. 16.43² =
  17. 17.82² =
  18. 18.79² =
  19. 19.84² =
  20. 20.73² =
  21. 21.39² =
  22. 22.49² =
  23. 23.41² =
  24. 24.42² =
  25. 25.76² =
  26. 26.59² =
  27. 27.72² =
  28. 28.94² =
  29. 29.35² =
  30. 30.81² =
  31. 31.85² =
  32. 32.32² =
  33. 33.34² =
  34. 34.64² =
  35. 35.56² =
  36. 36.54² =
  37. 37.68² =
  38. 38.61² =
  39. 39.47² =
  40. 40.53² =

Answer key

  1. 3844
  2. 2025
  3. 7569
  4. 8649
  5. 6084
  6. 1089
  7. 2116
  8. 2601
  9. 4489
  10. 2304
  11. 4356
  12. 1369
  13. 6889
  14. 3969
  15. 8281
  16. 1849
  17. 6724
  18. 6241
  19. 7056
  20. 5329
  21. 1521
  22. 2401
  23. 1681
  24. 1764
  25. 5776
  26. 3481
  27. 5184
  28. 8836
  29. 1225
  30. 6561
  31. 7225
  32. 1024
  33. 1156
  34. 4096
  35. 3136
  36. 2916
  37. 4624
  38. 3721
  39. 2209
  40. 2809

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