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Squaring 2-Digit Numbers Mentally Worksheet

Mental maths lesson 23: Square any 2-digit number: up and down · Set 154 · 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. 1.67² =
  2. 2.87² =
  3. 3.85² =
  4. 4.33² =
  5. 5.86² =
  6. 6.57² =
  7. 7.64² =
  8. 8.45² =
  9. 9.94² =
  10. 10.35² =
  11. 11.43² =
  12. 12.92² =
  13. 13.59² =
  14. 14.48² =
  15. 15.53² =
  16. 16.37² =
  17. 17.82² =
  18. 18.71² =
  19. 19.54² =
  20. 20.99² =
  21. 21.44² =
  22. 22.76² =
  23. 23.93² =
  24. 24.51² =
  25. 25.31² =
  26. 26.69² =
  27. 27.42² =
  28. 28.49² =
  29. 29.78² =
  30. 30.46² =
  31. 31.32² =
  32. 32.36² =
  33. 33.63² =
  34. 34.91² =
  35. 35.62² =
  36. 36.68² =
  37. 37.83² =
  38. 38.95² =
  39. 39.84² =
  40. 40.98² =

Answer key

  1. 4489
  2. 7569
  3. 7225
  4. 1089
  5. 7396
  6. 3249
  7. 4096
  8. 2025
  9. 8836
  10. 1225
  11. 1849
  12. 8464
  13. 3481
  14. 2304
  15. 2809
  16. 1369
  17. 6724
  18. 5041
  19. 2916
  20. 9801
  21. 1936
  22. 5776
  23. 8649
  24. 2601
  25. 961
  26. 4761
  27. 1764
  28. 2401
  29. 6084
  30. 2116
  31. 1024
  32. 1296
  33. 3969
  34. 8281
  35. 3844
  36. 4624
  37. 6889
  38. 9025
  39. 7056
  40. 9604

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