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Squaring 2-Digit Numbers Mentally Worksheet

Mental maths lesson 23: Square any 2-digit number: up and down · Set 45 · 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. 1.44² =
  2. 2.89² =
  3. 3.73² =
  4. 4.32² =
  5. 5.46² =
  6. 6.52² =
  7. 7.84² =
  8. 8.61² =
  9. 9.53² =
  10. 10.36² =
  11. 11.78² =
  12. 12.39² =
  13. 13.51² =
  14. 14.55² =
  15. 15.81² =
  16. 16.33² =
  17. 17.38² =
  18. 18.91² =
  19. 19.63² =
  20. 20.35² =
  21. 21.49² =
  22. 22.75² =
  23. 23.47² =
  24. 24.43² =
  25. 25.74² =
  26. 26.54² =
  27. 27.37² =
  28. 28.95² =
  29. 29.82² =
  30. 30.65² =
  31. 31.72² =
  32. 32.92² =
  33. 33.85² =
  34. 34.58² =
  35. 35.62² =
  36. 36.45² =
  37. 37.93² =
  38. 38.71² =
  39. 39.57² =
  40. 40.31² =

Answer key

  1. 1936
  2. 7921
  3. 5329
  4. 1024
  5. 2116
  6. 2704
  7. 7056
  8. 3721
  9. 2809
  10. 1296
  11. 6084
  12. 1521
  13. 2601
  14. 3025
  15. 6561
  16. 1089
  17. 1444
  18. 8281
  19. 3969
  20. 1225
  21. 2401
  22. 5625
  23. 2209
  24. 1849
  25. 5476
  26. 2916
  27. 1369
  28. 9025
  29. 6724
  30. 4225
  31. 5184
  32. 8464
  33. 7225
  34. 3364
  35. 3844
  36. 2025
  37. 8649
  38. 5041
  39. 3249
  40. 961

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