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Squaring 2-Digit Numbers Mentally Worksheet

Mental maths lesson 23: Square any 2-digit number: up and down · Set 732 · 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. 1.38² =
  2. 2.81² =
  3. 3.53² =
  4. 4.73² =
  5. 5.49² =
  6. 6.84² =
  7. 7.61² =
  8. 8.99² =
  9. 9.66² =
  10. 10.62² =
  11. 11.64² =
  12. 12.52² =
  13. 13.96² =
  14. 14.51² =
  15. 15.74² =
  16. 16.41² =
  17. 17.87² =
  18. 18.47² =
  19. 19.46² =
  20. 20.89² =
  21. 21.98² =
  22. 22.94² =
  23. 23.31² =
  24. 24.88² =
  25. 25.93² =
  26. 26.91² =
  27. 27.42² =
  28. 28.68² =
  29. 29.56² =
  30. 30.55² =
  31. 31.45² =
  32. 32.58² =
  33. 33.43² =
  34. 34.63² =
  35. 35.95² =
  36. 36.39² =
  37. 37.71² =
  38. 38.65² =
  39. 39.35² =
  40. 40.36² =

Answer key

  1. 1444
  2. 6561
  3. 2809
  4. 5329
  5. 2401
  6. 7056
  7. 3721
  8. 9801
  9. 4356
  10. 3844
  11. 4096
  12. 2704
  13. 9216
  14. 2601
  15. 5476
  16. 1681
  17. 7569
  18. 2209
  19. 2116
  20. 7921
  21. 9604
  22. 8836
  23. 961
  24. 7744
  25. 8649
  26. 8281
  27. 1764
  28. 4624
  29. 3136
  30. 3025
  31. 2025
  32. 3364
  33. 1849
  34. 3969
  35. 9025
  36. 1521
  37. 5041
  38. 4225
  39. 1225
  40. 1296

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