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Squaring 2-Digit Numbers Mentally Worksheet

Mental maths lesson 23: Square any 2-digit number: up and down · Set 9 · 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. 1.98² =
  2. 2.96² =
  3. 3.77² =
  4. 4.45² =
  5. 5.81² =
  6. 6.54² =
  7. 7.49² =
  8. 8.88² =
  9. 9.99² =
  10. 10.52² =
  11. 11.72² =
  12. 12.46² =
  13. 13.71² =
  14. 14.31² =
  15. 15.39² =
  16. 16.66² =
  17. 17.33² =
  18. 18.63² =
  19. 19.91² =
  20. 20.41² =
  21. 21.85² =
  22. 22.44² =
  23. 23.34² =
  24. 24.69² =
  25. 25.51² =
  26. 26.97² =
  27. 27.93² =
  28. 28.47² =
  29. 29.55² =
  30. 30.48² =
  31. 31.32² =
  32. 32.56² =
  33. 33.94² =
  34. 34.61² =
  35. 35.64² =
  36. 36.65² =
  37. 37.87² =
  38. 38.84² =
  39. 39.57² =
  40. 40.83² =

Answer key

  1. 9604
  2. 9216
  3. 5929
  4. 2025
  5. 6561
  6. 2916
  7. 2401
  8. 7744
  9. 9801
  10. 2704
  11. 5184
  12. 2116
  13. 5041
  14. 961
  15. 1521
  16. 4356
  17. 1089
  18. 3969
  19. 8281
  20. 1681
  21. 7225
  22. 1936
  23. 1156
  24. 4761
  25. 2601
  26. 9409
  27. 8649
  28. 2209
  29. 3025
  30. 2304
  31. 1024
  32. 3136
  33. 8836
  34. 3721
  35. 4096
  36. 4225
  37. 7569
  38. 7056
  39. 3249
  40. 6889

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