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Squaring 2-Digit Numbers Mentally Worksheet

Mental maths lesson 23: Square any 2-digit number: up and down · Set 97 · 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. 1.71² =
  2. 2.66² =
  3. 3.48² =
  4. 4.64² =
  5. 5.88² =
  6. 6.83² =
  7. 7.59² =
  8. 8.44² =
  9. 9.91² =
  10. 10.98² =
  11. 11.36² =
  12. 12.72² =
  13. 13.63² =
  14. 14.92² =
  15. 15.69² =
  16. 16.31² =
  17. 17.51² =
  18. 18.46² =
  19. 19.41² =
  20. 20.75² =
  21. 21.45² =
  22. 22.61² =
  23. 23.77² =
  24. 24.93² =
  25. 25.73² =
  26. 26.37² =
  27. 27.85² =
  28. 28.65² =
  29. 29.56² =
  30. 30.43² =
  31. 31.94² =
  32. 32.89² =
  33. 33.34² =
  34. 34.54² =
  35. 35.97² =
  36. 36.78² =
  37. 37.33² =
  38. 38.68² =
  39. 39.62² =
  40. 40.38² =

Answer key

  1. 5041
  2. 4356
  3. 2304
  4. 4096
  5. 7744
  6. 6889
  7. 3481
  8. 1936
  9. 8281
  10. 9604
  11. 1296
  12. 5184
  13. 3969
  14. 8464
  15. 4761
  16. 961
  17. 2601
  18. 2116
  19. 1681
  20. 5625
  21. 2025
  22. 3721
  23. 5929
  24. 8649
  25. 5329
  26. 1369
  27. 7225
  28. 4225
  29. 3136
  30. 1849
  31. 8836
  32. 7921
  33. 1156
  34. 2916
  35. 9409
  36. 6084
  37. 1089
  38. 4624
  39. 3844
  40. 1444

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