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Squaring 2-Digit Numbers Mentally Worksheet

Mental maths lesson 23: Square any 2-digit number: up and down · Set 454 · 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. 1.62² =
  2. 2.57² =
  3. 3.64² =
  4. 4.94² =
  5. 5.61² =
  6. 6.58² =
  7. 7.67² =
  8. 8.36² =
  9. 9.33² =
  10. 10.74² =
  11. 11.78² =
  12. 12.77² =
  13. 13.86² =
  14. 14.52² =
  15. 15.93² =
  16. 16.31² =
  17. 17.96² =
  18. 18.46² =
  19. 19.66² =
  20. 20.47² =
  21. 21.51² =
  22. 22.41² =
  23. 23.59² =
  24. 24.63² =
  25. 25.75² =
  26. 26.81² =
  27. 27.45² =
  28. 28.79² =
  29. 29.99² =
  30. 30.85² =
  31. 31.54² =
  32. 32.73² =
  33. 33.48² =
  34. 34.35² =
  35. 35.43² =
  36. 36.65² =
  37. 37.97² =
  38. 38.56² =
  39. 39.39² =
  40. 40.84² =

Answer key

  1. 3844
  2. 3249
  3. 4096
  4. 8836
  5. 3721
  6. 3364
  7. 4489
  8. 1296
  9. 1089
  10. 5476
  11. 6084
  12. 5929
  13. 7396
  14. 2704
  15. 8649
  16. 961
  17. 9216
  18. 2116
  19. 4356
  20. 2209
  21. 2601
  22. 1681
  23. 3481
  24. 3969
  25. 5625
  26. 6561
  27. 2025
  28. 6241
  29. 9801
  30. 7225
  31. 2916
  32. 5329
  33. 2304
  34. 1225
  35. 1849
  36. 4225
  37. 9409
  38. 3136
  39. 1521
  40. 7056

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