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Squaring 2-Digit Numbers Mentally Worksheet

Mental maths lesson 23: Square any 2-digit number: up and down · Set 96 · 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. 2.49² =
  3. 3.39² =
  4. 4.71² =
  5. 5.41² =
  6. 6.35² =
  7. 7.95² =
  8. 8.56² =
  9. 9.98² =
  10. 10.67² =
  11. 11.44² =
  12. 12.45² =
  13. 13.68² =
  14. 14.87² =
  15. 15.84² =
  16. 16.38² =
  17. 17.72² =
  18. 18.99² =
  19. 19.97² =
  20. 20.65² =
  21. 21.55² =
  22. 22.36² =
  23. 23.83² =
  24. 24.77² =
  25. 25.93² =
  26. 26.86² =
  27. 27.47² =
  28. 28.64² =
  29. 29.89² =
  30. 30.78² =
  31. 31.51² =
  32. 32.81² =
  33. 33.73² =
  34. 34.85² =
  35. 35.61² =
  36. 36.58² =
  37. 37.59² =
  38. 38.76² =
  39. 39.54² =
  40. 40.31² =

Answer key

  1. 8281
  2. 2401
  3. 1521
  4. 5041
  5. 1681
  6. 1225
  7. 9025
  8. 3136
  9. 9604
  10. 4489
  11. 1936
  12. 2025
  13. 4624
  14. 7569
  15. 7056
  16. 1444
  17. 5184
  18. 9801
  19. 9409
  20. 4225
  21. 3025
  22. 1296
  23. 6889
  24. 5929
  25. 8649
  26. 7396
  27. 2209
  28. 4096
  29. 7921
  30. 6084
  31. 2601
  32. 6561
  33. 5329
  34. 7225
  35. 3721
  36. 3364
  37. 3481
  38. 5776
  39. 2916
  40. 961

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