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Squaring 2-Digit Numbers Mentally Worksheet

Mental maths lesson 23: Square any 2-digit number: up and down · Set 284 · 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. 1.72² =
  2. 2.31² =
  3. 3.32² =
  4. 4.64² =
  5. 5.49² =
  6. 6.87² =
  7. 7.99² =
  8. 8.86² =
  9. 9.95² =
  10. 10.71² =
  11. 11.33² =
  12. 12.97² =
  13. 13.78² =
  14. 14.41² =
  15. 15.43² =
  16. 16.46² =
  17. 17.61² =
  18. 18.69² =
  19. 19.59² =
  20. 20.94² =
  21. 21.47² =
  22. 22.88² =
  23. 23.39² =
  24. 24.81² =
  25. 25.65² =
  26. 26.45² =
  27. 27.91² =
  28. 28.63² =
  29. 29.83² =
  30. 30.79² =
  31. 31.57² =
  32. 32.82² =
  33. 33.55² =
  34. 34.66² =
  35. 35.93² =
  36. 36.74² =
  37. 37.62² =
  38. 38.75² =
  39. 39.73² =
  40. 40.34² =

Answer key

  1. 5184
  2. 961
  3. 1024
  4. 4096
  5. 2401
  6. 7569
  7. 9801
  8. 7396
  9. 9025
  10. 5041
  11. 1089
  12. 9409
  13. 6084
  14. 1681
  15. 1849
  16. 2116
  17. 3721
  18. 4761
  19. 3481
  20. 8836
  21. 2209
  22. 7744
  23. 1521
  24. 6561
  25. 4225
  26. 2025
  27. 8281
  28. 3969
  29. 6889
  30. 6241
  31. 3249
  32. 6724
  33. 3025
  34. 4356
  35. 8649
  36. 5476
  37. 3844
  38. 5625
  39. 5329
  40. 1156

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