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Squaring 2-Digit Numbers Mentally Worksheet

Mental maths lesson 23: Square any 2-digit number: up and down · Set 819 · 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. 1.42² =
  2. 2.81² =
  3. 3.54² =
  4. 4.89² =
  5. 5.73² =
  6. 6.94² =
  7. 7.61² =
  8. 8.72² =
  9. 9.41² =
  10. 10.32² =
  11. 11.93² =
  12. 12.91² =
  13. 13.31² =
  14. 14.39² =
  15. 15.43² =
  16. 16.88² =
  17. 17.33² =
  18. 18.97² =
  19. 19.45² =
  20. 20.35² =
  21. 21.75² =
  22. 22.96² =
  23. 23.44² =
  24. 24.82² =
  25. 25.48² =
  26. 26.87² =
  27. 27.68² =
  28. 28.63² =
  29. 29.51² =
  30. 30.57² =
  31. 31.78² =
  32. 32.69² =
  33. 33.58² =
  34. 34.47² =
  35. 35.53² =
  36. 36.95² =
  37. 37.38² =
  38. 38.99² =
  39. 39.52² =
  40. 40.79² =

Answer key

  1. 1764
  2. 6561
  3. 2916
  4. 7921
  5. 5329
  6. 8836
  7. 3721
  8. 5184
  9. 1681
  10. 1024
  11. 8649
  12. 8281
  13. 961
  14. 1521
  15. 1849
  16. 7744
  17. 1089
  18. 9409
  19. 2025
  20. 1225
  21. 5625
  22. 9216
  23. 1936
  24. 6724
  25. 2304
  26. 7569
  27. 4624
  28. 3969
  29. 2601
  30. 3249
  31. 6084
  32. 4761
  33. 3364
  34. 2209
  35. 2809
  36. 9025
  37. 1444
  38. 9801
  39. 2704
  40. 6241

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