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Squaring 2-Digit Numbers Mentally Worksheet

Mental maths lesson 23: Square any 2-digit number: up and down · Set 712 · 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. 1.83² =
  2. 2.77² =
  3. 3.42² =
  4. 4.74² =
  5. 5.48² =
  6. 6.38² =
  7. 7.32² =
  8. 8.66² =
  9. 9.45² =
  10. 10.96² =
  11. 11.97² =
  12. 12.58² =
  13. 13.69² =
  14. 14.93² =
  15. 15.41² =
  16. 16.55² =
  17. 17.91² =
  18. 18.88² =
  19. 19.53² =
  20. 20.67² =
  21. 21.82² =
  22. 22.44² =
  23. 23.71² =
  24. 24.79² =
  25. 25.65² =
  26. 26.64² =
  27. 27.37² =
  28. 28.61² =
  29. 29.63² =
  30. 30.49² =
  31. 31.51² =
  32. 32.68² =
  33. 33.57² =
  34. 34.78² =
  35. 35.89² =
  36. 36.36² =
  37. 37.95² =
  38. 38.47² =
  39. 39.85² =
  40. 40.31² =

Answer key

  1. 6889
  2. 5929
  3. 1764
  4. 5476
  5. 2304
  6. 1444
  7. 1024
  8. 4356
  9. 2025
  10. 9216
  11. 9409
  12. 3364
  13. 4761
  14. 8649
  15. 1681
  16. 3025
  17. 8281
  18. 7744
  19. 2809
  20. 4489
  21. 6724
  22. 1936
  23. 5041
  24. 6241
  25. 4225
  26. 4096
  27. 1369
  28. 3721
  29. 3969
  30. 2401
  31. 2601
  32. 4624
  33. 3249
  34. 6084
  35. 7921
  36. 1296
  37. 9025
  38. 2209
  39. 7225
  40. 961

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