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Squaring 2-Digit Numbers Mentally Worksheet

Mental maths lesson 23: Square any 2-digit number: up and down · Set 472 · 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. 1.57² =
  2. 2.78² =
  3. 3.81² =
  4. 4.58² =
  5. 5.32² =
  6. 6.77² =
  7. 7.97² =
  8. 8.72² =
  9. 9.43² =
  10. 10.64² =
  11. 11.84² =
  12. 12.46² =
  13. 13.37² =
  14. 14.51² =
  15. 15.41² =
  16. 16.39² =
  17. 17.91² =
  18. 18.79² =
  19. 19.56² =
  20. 20.59² =
  21. 21.92² =
  22. 22.33² =
  23. 23.85² =
  24. 24.83² =
  25. 25.42² =
  26. 26.87² =
  27. 27.34² =
  28. 28.54² =
  29. 29.31² =
  30. 30.61² =
  31. 31.62² =
  32. 32.75² =
  33. 33.95² =
  34. 34.69² =
  35. 35.44² =
  36. 36.82² =
  37. 37.52² =
  38. 38.45² =
  39. 39.73² =
  40. 40.76² =

Answer key

  1. 3249
  2. 6084
  3. 6561
  4. 3364
  5. 1024
  6. 5929
  7. 9409
  8. 5184
  9. 1849
  10. 4096
  11. 7056
  12. 2116
  13. 1369
  14. 2601
  15. 1681
  16. 1521
  17. 8281
  18. 6241
  19. 3136
  20. 3481
  21. 8464
  22. 1089
  23. 7225
  24. 6889
  25. 1764
  26. 7569
  27. 1156
  28. 2916
  29. 961
  30. 3721
  31. 3844
  32. 5625
  33. 9025
  34. 4761
  35. 1936
  36. 6724
  37. 2704
  38. 2025
  39. 5329
  40. 5776

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