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Squaring 2-Digit Numbers Mentally Worksheet

Mental maths lesson 23: Square any 2-digit number: up and down · Set 195 · 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. 1.43² =
  2. 2.63² =
  3. 3.82² =
  4. 4.97² =
  5. 5.79² =
  6. 6.94² =
  7. 7.36² =
  8. 8.75² =
  9. 9.32² =
  10. 10.51² =
  11. 11.38² =
  12. 12.77² =
  13. 13.95² =
  14. 14.84² =
  15. 15.39² =
  16. 16.35² =
  17. 17.73² =
  18. 18.48² =
  19. 19.33² =
  20. 20.99² =
  21. 21.45² =
  22. 22.96² =
  23. 23.91² =
  24. 24.61² =
  25. 25.71² =
  26. 26.59² =
  27. 27.47² =
  28. 28.34² =
  29. 29.62² =
  30. 30.89² =
  31. 31.85² =
  32. 32.93² =
  33. 33.41² =
  34. 34.98² =
  35. 35.44² =
  36. 36.42² =
  37. 37.67² =
  38. 38.78² =
  39. 39.65² =
  40. 40.31² =

Answer key

  1. 1849
  2. 3969
  3. 6724
  4. 9409
  5. 6241
  6. 8836
  7. 1296
  8. 5625
  9. 1024
  10. 2601
  11. 1444
  12. 5929
  13. 9025
  14. 7056
  15. 1521
  16. 1225
  17. 5329
  18. 2304
  19. 1089
  20. 9801
  21. 2025
  22. 9216
  23. 8281
  24. 3721
  25. 5041
  26. 3481
  27. 2209
  28. 1156
  29. 3844
  30. 7921
  31. 7225
  32. 8649
  33. 1681
  34. 9604
  35. 1936
  36. 1764
  37. 4489
  38. 6084
  39. 4225
  40. 961

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