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Squaring 2-Digit Numbers Mentally Worksheet

Mental maths lesson 23: Square any 2-digit number: up and down · Set 147 · 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. 2.43² =
  3. 3.99² =
  4. 4.78² =
  5. 5.64² =
  6. 6.94² =
  7. 7.62² =
  8. 8.72² =
  9. 9.49² =
  10. 10.91² =
  11. 11.68² =
  12. 12.36² =
  13. 13.63² =
  14. 14.65² =
  15. 15.98² =
  16. 16.75² =
  17. 17.97² =
  18. 18.45² =
  19. 19.46² =
  20. 20.35² =
  21. 21.51² =
  22. 22.41² =
  23. 23.52² =
  24. 24.58² =
  25. 25.32² =
  26. 26.57² =
  27. 27.93² =
  28. 28.56² =
  29. 29.69² =
  30. 30.88² =
  31. 31.76² =
  32. 32.77² =
  33. 33.48² =
  34. 34.33² =
  35. 35.87² =
  36. 36.39² =
  37. 37.53² =
  38. 38.95² =
  39. 39.73² =
  40. 40.54² =

Answer key

  1. 5041
  2. 1849
  3. 9801
  4. 6084
  5. 4096
  6. 8836
  7. 3844
  8. 5184
  9. 2401
  10. 8281
  11. 4624
  12. 1296
  13. 3969
  14. 4225
  15. 9604
  16. 5625
  17. 9409
  18. 2025
  19. 2116
  20. 1225
  21. 2601
  22. 1681
  23. 2704
  24. 3364
  25. 1024
  26. 3249
  27. 8649
  28. 3136
  29. 4761
  30. 7744
  31. 5776
  32. 5929
  33. 2304
  34. 1089
  35. 7569
  36. 1521
  37. 2809
  38. 9025
  39. 5329
  40. 2916

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