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Squaring 2-Digit Numbers Mentally Worksheet

Mental maths lesson 23: Square any 2-digit number: up and down · Set 480 · 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. 1.64² =
  2. 2.33² =
  3. 3.98² =
  4. 4.51² =
  5. 5.75² =
  6. 6.57² =
  7. 7.66² =
  8. 8.32² =
  9. 9.93² =
  10. 10.39² =
  11. 11.88² =
  12. 12.47² =
  13. 13.65² =
  14. 14.46² =
  15. 15.63² =
  16. 16.35² =
  17. 17.49² =
  18. 18.58² =
  19. 19.91² =
  20. 20.61² =
  21. 21.89² =
  22. 22.52² =
  23. 23.87² =
  24. 24.81² =
  25. 25.77² =
  26. 26.45² =
  27. 27.92² =
  28. 28.76² =
  29. 29.74² =
  30. 30.53² =
  31. 31.43² =
  32. 32.99² =
  33. 33.55² =
  34. 34.48² =
  35. 35.59² =
  36. 36.96² =
  37. 37.68² =
  38. 38.84² =
  39. 39.31² =
  40. 40.62² =

Answer key

  1. 4096
  2. 1089
  3. 9604
  4. 2601
  5. 5625
  6. 3249
  7. 4356
  8. 1024
  9. 8649
  10. 1521
  11. 7744
  12. 2209
  13. 4225
  14. 2116
  15. 3969
  16. 1225
  17. 2401
  18. 3364
  19. 8281
  20. 3721
  21. 7921
  22. 2704
  23. 7569
  24. 6561
  25. 5929
  26. 2025
  27. 8464
  28. 5776
  29. 5476
  30. 2809
  31. 1849
  32. 9801
  33. 3025
  34. 2304
  35. 3481
  36. 9216
  37. 4624
  38. 7056
  39. 961
  40. 3844

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