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Squaring 2-Digit Numbers Mentally Worksheet

Mental maths lesson 23: Square any 2-digit number: up and down · Set 625 · 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. 1.85² =
  2. 2.98² =
  3. 3.41² =
  4. 4.77² =
  5. 5.73² =
  6. 6.61² =
  7. 7.53² =
  8. 8.42² =
  9. 9.31² =
  10. 10.57² =
  11. 11.84² =
  12. 12.81² =
  13. 13.47² =
  14. 14.99² =
  15. 15.83² =
  16. 16.95² =
  17. 17.58² =
  18. 18.46² =
  19. 19.96² =
  20. 20.67² =
  21. 21.51² =
  22. 22.43² =
  23. 23.78² =
  24. 24.87² =
  25. 25.92² =
  26. 26.89² =
  27. 27.71² =
  28. 28.65² =
  29. 29.91² =
  30. 30.74² =
  31. 31.63² =
  32. 32.97² =
  33. 33.39² =
  34. 34.45² =
  35. 35.35² =
  36. 36.48² =
  37. 37.66² =
  38. 38.32² =
  39. 39.36² =
  40. 40.56² =

Answer key

  1. 7225
  2. 9604
  3. 1681
  4. 5929
  5. 5329
  6. 3721
  7. 2809
  8. 1764
  9. 961
  10. 3249
  11. 7056
  12. 6561
  13. 2209
  14. 9801
  15. 6889
  16. 9025
  17. 3364
  18. 2116
  19. 9216
  20. 4489
  21. 2601
  22. 1849
  23. 6084
  24. 7569
  25. 8464
  26. 7921
  27. 5041
  28. 4225
  29. 8281
  30. 5476
  31. 3969
  32. 9409
  33. 1521
  34. 2025
  35. 1225
  36. 2304
  37. 4356
  38. 1024
  39. 1296
  40. 3136

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