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Squaring 2-Digit Numbers Mentally Worksheet

Mental maths lesson 23: Square any 2-digit number: up and down · Set 723 · 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. 1.43² =
  2. 2.81² =
  3. 3.58² =
  4. 4.73² =
  5. 5.87² =
  6. 6.61² =
  7. 7.37² =
  8. 8.95² =
  9. 9.78² =
  10. 10.91² =
  11. 11.32² =
  12. 12.96² =
  13. 13.62² =
  14. 14.69² =
  15. 15.52² =
  16. 16.82² =
  17. 17.98² =
  18. 18.93² =
  19. 19.36² =
  20. 20.94² =
  21. 21.31² =
  22. 22.88² =
  23. 23.35² =
  24. 24.66² =
  25. 25.71² =
  26. 26.97² =
  27. 27.64² =
  28. 28.63² =
  29. 29.59² =
  30. 30.41² =
  31. 31.45² =
  32. 32.84² =
  33. 33.54² =
  34. 34.51² =
  35. 35.86² =
  36. 36.33² =
  37. 37.79² =
  38. 38.74² =
  39. 39.67² =
  40. 40.42² =

Answer key

  1. 1849
  2. 6561
  3. 3364
  4. 5329
  5. 7569
  6. 3721
  7. 1369
  8. 9025
  9. 6084
  10. 8281
  11. 1024
  12. 9216
  13. 3844
  14. 4761
  15. 2704
  16. 6724
  17. 9604
  18. 8649
  19. 1296
  20. 8836
  21. 961
  22. 7744
  23. 1225
  24. 4356
  25. 5041
  26. 9409
  27. 4096
  28. 3969
  29. 3481
  30. 1681
  31. 2025
  32. 7056
  33. 2916
  34. 2601
  35. 7396
  36. 1089
  37. 6241
  38. 5476
  39. 4489
  40. 1764

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