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Squaring 2-Digit Numbers Mentally Worksheet

Mental maths lesson 23: Square any 2-digit number: up and down · Set 215 · 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. 1.51² =
  2. 2.69² =
  3. 3.37² =
  4. 4.33² =
  5. 5.38² =
  6. 6.75² =
  7. 7.97² =
  8. 8.93² =
  9. 9.88² =
  10. 10.76² =
  11. 11.48² =
  12. 12.47² =
  13. 13.95² =
  14. 14.58² =
  15. 15.87² =
  16. 16.91² =
  17. 17.84² =
  18. 18.43² =
  19. 19.42² =
  20. 20.31² =
  21. 21.41² =
  22. 22.57² =
  23. 23.96² =
  24. 24.66² =
  25. 25.39² =
  26. 26.35² =
  27. 27.32² =
  28. 28.74² =
  29. 29.55² =
  30. 30.85² =
  31. 31.82² =
  32. 32.77² =
  33. 33.34² =
  34. 34.83² =
  35. 35.54² =
  36. 36.78² =
  37. 37.61² =
  38. 38.79² =
  39. 39.81² =
  40. 40.45² =

Answer key

  1. 2601
  2. 4761
  3. 1369
  4. 1089
  5. 1444
  6. 5625
  7. 9409
  8. 8649
  9. 7744
  10. 5776
  11. 2304
  12. 2209
  13. 9025
  14. 3364
  15. 7569
  16. 8281
  17. 7056
  18. 1849
  19. 1764
  20. 961
  21. 1681
  22. 3249
  23. 9216
  24. 4356
  25. 1521
  26. 1225
  27. 1024
  28. 5476
  29. 3025
  30. 7225
  31. 6724
  32. 5929
  33. 1156
  34. 6889
  35. 2916
  36. 6084
  37. 3721
  38. 6241
  39. 6561
  40. 2025

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