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Squaring 2-Digit Numbers Mentally Worksheet

Mental maths lesson 23: Square any 2-digit number: up and down · Set 56 · 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. 1.31² =
  2. 2.33² =
  3. 3.47² =
  4. 4.66² =
  5. 5.91² =
  6. 6.41² =
  7. 7.96² =
  8. 8.83² =
  9. 9.72² =
  10. 10.62² =
  11. 11.81² =
  12. 12.59² =
  13. 13.39² =
  14. 14.78² =
  15. 15.64² =
  16. 16.68² =
  17. 17.94² =
  18. 18.84² =
  19. 19.73² =
  20. 20.35² =
  21. 21.85² =
  22. 22.97² =
  23. 23.44² =
  24. 24.52² =
  25. 25.74² =
  26. 26.37² =
  27. 27.49² =
  28. 28.54² =
  29. 29.48² =
  30. 30.61² =
  31. 31.51² =
  32. 32.36² =
  33. 33.42² =
  34. 34.75² =
  35. 35.57² =
  36. 36.71² =
  37. 37.63² =
  38. 38.65² =
  39. 39.32² =
  40. 40.34² =

Answer key

  1. 961
  2. 1089
  3. 2209
  4. 4356
  5. 8281
  6. 1681
  7. 9216
  8. 6889
  9. 5184
  10. 3844
  11. 6561
  12. 3481
  13. 1521
  14. 6084
  15. 4096
  16. 4624
  17. 8836
  18. 7056
  19. 5329
  20. 1225
  21. 7225
  22. 9409
  23. 1936
  24. 2704
  25. 5476
  26. 1369
  27. 2401
  28. 2916
  29. 2304
  30. 3721
  31. 2601
  32. 1296
  33. 1764
  34. 5625
  35. 3249
  36. 5041
  37. 3969
  38. 4225
  39. 1024
  40. 1156

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