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Squaring 2-Digit Numbers Mentally Worksheet

Mental maths lesson 23: Square any 2-digit number: up and down · Set 654 · 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. 1.37² =
  2. 2.72² =
  3. 3.87² =
  4. 4.33² =
  5. 5.59² =
  6. 6.82² =
  7. 7.84² =
  8. 8.61² =
  9. 9.63² =
  10. 10.74² =
  11. 11.38² =
  12. 12.83² =
  13. 13.65² =
  14. 14.54² =
  15. 15.39² =
  16. 16.67² =
  17. 17.51² =
  18. 18.94² =
  19. 19.56² =
  20. 20.48² =
  21. 21.79² =
  22. 22.78² =
  23. 23.68² =
  24. 24.91² =
  25. 25.89² =
  26. 26.41² =
  27. 27.36² =
  28. 28.49² =
  29. 29.32² =
  30. 30.85² =
  31. 31.64² =
  32. 32.52² =
  33. 33.42² =
  34. 34.75² =
  35. 35.62² =
  36. 36.93² =
  37. 37.73² =
  38. 38.47² =
  39. 39.57² =
  40. 40.44² =

Answer key

  1. 1369
  2. 5184
  3. 7569
  4. 1089
  5. 3481
  6. 6724
  7. 7056
  8. 3721
  9. 3969
  10. 5476
  11. 1444
  12. 6889
  13. 4225
  14. 2916
  15. 1521
  16. 4489
  17. 2601
  18. 8836
  19. 3136
  20. 2304
  21. 6241
  22. 6084
  23. 4624
  24. 8281
  25. 7921
  26. 1681
  27. 1296
  28. 2401
  29. 1024
  30. 7225
  31. 4096
  32. 2704
  33. 1764
  34. 5625
  35. 3844
  36. 8649
  37. 5329
  38. 2209
  39. 3249
  40. 1936

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