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Squaring 2-Digit Numbers Mentally Worksheet

Mental maths lesson 23: Square any 2-digit number: up and down · Set 422 · 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. 1.57² =
  2. 2.46² =
  3. 3.35² =
  4. 4.63² =
  5. 5.89² =
  6. 6.71² =
  7. 7.77² =
  8. 8.53² =
  9. 9.62² =
  10. 10.36² =
  11. 11.52² =
  12. 12.74² =
  13. 13.94² =
  14. 14.73² =
  15. 15.51² =
  16. 16.93² =
  17. 17.38² =
  18. 18.41² =
  19. 19.96² =
  20. 20.32² =
  21. 21.84² =
  22. 22.49² =
  23. 23.99² =
  24. 24.66² =
  25. 25.45² =
  26. 26.76² =
  27. 27.91² =
  28. 28.64² =
  29. 29.98² =
  30. 30.72² =
  31. 31.68² =
  32. 32.54² =
  33. 33.78² =
  34. 34.87² =
  35. 35.88² =
  36. 36.79² =
  37. 37.43² =
  38. 38.58² =
  39. 39.42² =
  40. 40.48² =

Answer key

  1. 3249
  2. 2116
  3. 1225
  4. 3969
  5. 7921
  6. 5041
  7. 5929
  8. 2809
  9. 3844
  10. 1296
  11. 2704
  12. 5476
  13. 8836
  14. 5329
  15. 2601
  16. 8649
  17. 1444
  18. 1681
  19. 9216
  20. 1024
  21. 7056
  22. 2401
  23. 9801
  24. 4356
  25. 2025
  26. 5776
  27. 8281
  28. 4096
  29. 9604
  30. 5184
  31. 4624
  32. 2916
  33. 6084
  34. 7569
  35. 7744
  36. 6241
  37. 1849
  38. 3364
  39. 1764
  40. 2304

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