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Squaring 2-Digit Numbers Mentally Worksheet

Mental maths lesson 23: Square any 2-digit number: up and down · Set 226 · 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. 2.73² =
  3. 3.32² =
  4. 4.41² =
  5. 5.45² =
  6. 6.94² =
  7. 7.82² =
  8. 8.46² =
  9. 9.35² =
  10. 10.61² =
  11. 11.48² =
  12. 12.44² =
  13. 13.55² =
  14. 14.74² =
  15. 15.64² =
  16. 16.36² =
  17. 17.85² =
  18. 18.88² =
  19. 19.39² =
  20. 20.87² =
  21. 21.43² =
  22. 22.91² =
  23. 23.77² =
  24. 24.42² =
  25. 25.66² =
  26. 26.63² =
  27. 27.51² =
  28. 28.33² =
  29. 29.52² =
  30. 30.37² =
  31. 31.69² =
  32. 32.31² =
  33. 33.65² =
  34. 34.54² =
  35. 35.95² =
  36. 36.99² =
  37. 37.84² =
  38. 38.78² =
  39. 39.56² =
  40. 40.72² =

Answer key

  1. 9604
  2. 5329
  3. 1024
  4. 1681
  5. 2025
  6. 8836
  7. 6724
  8. 2116
  9. 1225
  10. 3721
  11. 2304
  12. 1936
  13. 3025
  14. 5476
  15. 4096
  16. 1296
  17. 7225
  18. 7744
  19. 1521
  20. 7569
  21. 1849
  22. 8281
  23. 5929
  24. 1764
  25. 4356
  26. 3969
  27. 2601
  28. 1089
  29. 2704
  30. 1369
  31. 4761
  32. 961
  33. 4225
  34. 2916
  35. 9025
  36. 9801
  37. 7056
  38. 6084
  39. 3136
  40. 5184

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