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Squaring 2-Digit Numbers Mentally Worksheet

Mental maths lesson 23: Square any 2-digit number: up and down · Set 216 · 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. 1.33² =
  2. 2.97² =
  3. 3.71² =
  4. 4.84² =
  5. 5.53² =
  6. 6.91² =
  7. 7.38² =
  8. 8.42² =
  9. 9.58² =
  10. 10.39² =
  11. 11.82² =
  12. 12.59² =
  13. 13.87² =
  14. 14.85² =
  15. 15.43² =
  16. 16.77² =
  17. 17.99² =
  18. 18.35² =
  19. 19.45² =
  20. 20.64² =
  21. 21.86² =
  22. 22.89² =
  23. 23.68² =
  24. 24.41² =
  25. 25.93² =
  26. 26.66² =
  27. 27.69² =
  28. 28.46² =
  29. 29.44² =
  30. 30.81² =
  31. 31.61² =
  32. 32.94² =
  33. 33.32² =
  34. 34.73² =
  35. 35.31² =
  36. 36.96² =
  37. 37.34² =
  38. 38.54² =
  39. 39.76² =
  40. 40.83² =

Answer key

  1. 1089
  2. 9409
  3. 5041
  4. 7056
  5. 2809
  6. 8281
  7. 1444
  8. 1764
  9. 3364
  10. 1521
  11. 6724
  12. 3481
  13. 7569
  14. 7225
  15. 1849
  16. 5929
  17. 9801
  18. 1225
  19. 2025
  20. 4096
  21. 7396
  22. 7921
  23. 4624
  24. 1681
  25. 8649
  26. 4356
  27. 4761
  28. 2116
  29. 1936
  30. 6561
  31. 3721
  32. 8836
  33. 1024
  34. 5329
  35. 961
  36. 9216
  37. 1156
  38. 2916
  39. 5776
  40. 6889

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