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Squaring 2-Digit Numbers Mentally Worksheet

Mental maths lesson 23: Square any 2-digit number: up and down · Set 271 · 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. 2.41² =
  3. 3.47² =
  4. 4.64² =
  5. 5.95² =
  6. 6.31² =
  7. 7.39² =
  8. 8.92² =
  9. 9.73² =
  10. 10.62² =
  11. 11.55² =
  12. 12.72² =
  13. 13.48² =
  14. 14.32² =
  15. 15.51² =
  16. 16.93² =
  17. 17.61² =
  18. 18.57² =
  19. 19.46² =
  20. 20.68² =
  21. 21.49² =
  22. 22.76² =
  23. 23.84² =
  24. 24.56² =
  25. 25.71² =
  26. 26.85² =
  27. 27.78² =
  28. 28.94² =
  29. 29.66² =
  30. 30.36² =
  31. 31.87² =
  32. 32.82² =
  33. 33.44² =
  34. 34.43² =
  35. 35.77² =
  36. 36.53² =
  37. 37.45² =
  38. 38.34² =
  39. 39.91² =
  40. 40.98² =

Answer key

  1. 6889
  2. 1681
  3. 2209
  4. 4096
  5. 9025
  6. 961
  7. 1521
  8. 8464
  9. 5329
  10. 3844
  11. 3025
  12. 5184
  13. 2304
  14. 1024
  15. 2601
  16. 8649
  17. 3721
  18. 3249
  19. 2116
  20. 4624
  21. 2401
  22. 5776
  23. 7056
  24. 3136
  25. 5041
  26. 7225
  27. 6084
  28. 8836
  29. 4356
  30. 1296
  31. 7569
  32. 6724
  33. 1936
  34. 1849
  35. 5929
  36. 2809
  37. 2025
  38. 1156
  39. 8281
  40. 9604

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