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Squaring 2-Digit Numbers Mentally Worksheet

Mental maths lesson 23: Square any 2-digit number: up and down · Set 160 · 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. 1.91² =
  2. 2.38² =
  3. 3.51² =
  4. 4.55² =
  5. 5.61² =
  6. 6.71² =
  7. 7.78² =
  8. 8.86² =
  9. 9.89² =
  10. 10.98² =
  11. 11.31² =
  12. 12.41² =
  13. 13.85² =
  14. 14.69² =
  15. 15.99² =
  16. 16.44² =
  17. 17.57² =
  18. 18.97² =
  19. 19.42² =
  20. 20.96² =
  21. 21.36² =
  22. 22.83² =
  23. 23.54² =
  24. 24.46² =
  25. 25.73² =
  26. 26.33² =
  27. 27.62² =
  28. 28.77² =
  29. 29.47² =
  30. 30.37² =
  31. 31.32² =
  32. 32.64² =
  33. 33.66² =
  34. 34.95² =
  35. 35.93² =
  36. 36.84² =
  37. 37.81² =
  38. 38.58² =
  39. 39.92² =
  40. 40.49² =

Answer key

  1. 8281
  2. 1444
  3. 2601
  4. 3025
  5. 3721
  6. 5041
  7. 6084
  8. 7396
  9. 7921
  10. 9604
  11. 961
  12. 1681
  13. 7225
  14. 4761
  15. 9801
  16. 1936
  17. 3249
  18. 9409
  19. 1764
  20. 9216
  21. 1296
  22. 6889
  23. 2916
  24. 2116
  25. 5329
  26. 1089
  27. 3844
  28. 5929
  29. 2209
  30. 1369
  31. 1024
  32. 4096
  33. 4356
  34. 9025
  35. 8649
  36. 7056
  37. 6561
  38. 3364
  39. 8464
  40. 2401

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