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Squaring 2-Digit Numbers Mentally Worksheet

Mental maths lesson 23: Square any 2-digit number: up and down · Set 413 · 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. 1.85² =
  2. 2.97² =
  3. 3.73² =
  4. 4.41² =
  5. 5.51² =
  6. 6.53² =
  7. 7.32² =
  8. 8.88² =
  9. 9.96² =
  10. 10.91² =
  11. 11.65² =
  12. 12.36² =
  13. 13.83² =
  14. 14.99² =
  15. 15.69² =
  16. 16.35² =
  17. 17.31² =
  18. 18.74² =
  19. 19.77² =
  20. 20.45² =
  21. 21.59² =
  22. 22.72² =
  23. 23.57² =
  24. 24.38² =
  25. 25.82² =
  26. 26.63² =
  27. 27.92² =
  28. 28.94² =
  29. 29.48² =
  30. 30.93² =
  31. 31.71² =
  32. 32.44² =
  33. 33.55² =
  34. 34.47² =
  35. 35.75² =
  36. 36.46² =
  37. 37.78² =
  38. 38.61² =
  39. 39.67² =
  40. 40.42² =

Answer key

  1. 7225
  2. 9409
  3. 5329
  4. 1681
  5. 2601
  6. 2809
  7. 1024
  8. 7744
  9. 9216
  10. 8281
  11. 4225
  12. 1296
  13. 6889
  14. 9801
  15. 4761
  16. 1225
  17. 961
  18. 5476
  19. 5929
  20. 2025
  21. 3481
  22. 5184
  23. 3249
  24. 1444
  25. 6724
  26. 3969
  27. 8464
  28. 8836
  29. 2304
  30. 8649
  31. 5041
  32. 1936
  33. 3025
  34. 2209
  35. 5625
  36. 2116
  37. 6084
  38. 3721
  39. 4489
  40. 1764

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