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Squaring 2-Digit Numbers Mentally Worksheet

Mental maths lesson 23: Square any 2-digit number: up and down · Set 224 · 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. 1.79² =
  2. 2.31² =
  3. 3.94² =
  4. 4.91² =
  5. 5.85² =
  6. 6.61² =
  7. 7.63² =
  8. 8.75² =
  9. 9.34² =
  10. 10.37² =
  11. 11.88² =
  12. 12.93² =
  13. 13.82² =
  14. 14.53² =
  15. 15.51² =
  16. 16.86² =
  17. 17.71² =
  18. 18.46² =
  19. 19.43² =
  20. 20.41² =
  21. 21.72² =
  22. 22.74² =
  23. 23.78² =
  24. 24.58² =
  25. 25.42² =
  26. 26.49² =
  27. 27.87² =
  28. 28.62² =
  29. 29.36² =
  30. 30.54² =
  31. 31.99² =
  32. 32.55² =
  33. 33.45² =
  34. 34.56² =
  35. 35.38² =
  36. 36.52² =
  37. 37.57² =
  38. 38.77² =
  39. 39.32² =
  40. 40.33² =

Answer key

  1. 6241
  2. 961
  3. 8836
  4. 8281
  5. 7225
  6. 3721
  7. 3969
  8. 5625
  9. 1156
  10. 1369
  11. 7744
  12. 8649
  13. 6724
  14. 2809
  15. 2601
  16. 7396
  17. 5041
  18. 2116
  19. 1849
  20. 1681
  21. 5184
  22. 5476
  23. 6084
  24. 3364
  25. 1764
  26. 2401
  27. 7569
  28. 3844
  29. 1296
  30. 2916
  31. 9801
  32. 3025
  33. 2025
  34. 3136
  35. 1444
  36. 2704
  37. 3249
  38. 5929
  39. 1024
  40. 1089

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