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Squaring 2-Digit Numbers Mentally Worksheet

Mental maths lesson 23: Square any 2-digit number: up and down · Set 731 · 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. 1.59² =
  2. 2.75² =
  3. 3.92² =
  4. 4.44² =
  5. 5.78² =
  6. 6.35² =
  7. 7.32² =
  8. 8.68² =
  9. 9.39² =
  10. 10.65² =
  11. 11.61² =
  12. 12.34² =
  13. 13.64² =
  14. 14.55² =
  15. 15.45² =
  16. 16.41² =
  17. 17.97² =
  18. 18.33² =
  19. 19.46² =
  20. 20.36² =
  21. 21.49² =
  22. 22.52² =
  23. 23.43² =
  24. 24.84² =
  25. 25.93² =
  26. 26.89² =
  27. 27.82² =
  28. 28.38² =
  29. 29.63² =
  30. 30.91² =
  31. 31.58² =
  32. 32.96² =
  33. 33.94² =
  34. 34.51² =
  35. 35.81² =
  36. 36.62² =
  37. 37.79² =
  38. 38.77² =
  39. 39.71² =
  40. 40.74² =

Answer key

  1. 3481
  2. 5625
  3. 8464
  4. 1936
  5. 6084
  6. 1225
  7. 1024
  8. 4624
  9. 1521
  10. 4225
  11. 3721
  12. 1156
  13. 4096
  14. 3025
  15. 2025
  16. 1681
  17. 9409
  18. 1089
  19. 2116
  20. 1296
  21. 2401
  22. 2704
  23. 1849
  24. 7056
  25. 8649
  26. 7921
  27. 6724
  28. 1444
  29. 3969
  30. 8281
  31. 3364
  32. 9216
  33. 8836
  34. 2601
  35. 6561
  36. 3844
  37. 6241
  38. 5929
  39. 5041
  40. 5476

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