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Squaring 2-Digit Numbers Mentally Worksheet

Mental maths lesson 23: Square any 2-digit number: up and down · Set 556 · 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. 1.45² =
  2. 2.34² =
  3. 3.91² =
  4. 4.93² =
  5. 5.69² =
  6. 6.78² =
  7. 7.64² =
  8. 8.79² =
  9. 9.83² =
  10. 10.98² =
  11. 11.75² =
  12. 12.58² =
  13. 13.35² =
  14. 14.68² =
  15. 15.76² =
  16. 16.57² =
  17. 17.36² =
  18. 18.77² =
  19. 19.89² =
  20. 20.99² =
  21. 21.97² =
  22. 22.67² =
  23. 23.61² =
  24. 24.41² =
  25. 25.95² =
  26. 26.55² =
  27. 27.53² =
  28. 28.96² =
  29. 29.84² =
  30. 30.31² =
  31. 31.37² =
  32. 32.81² =
  33. 33.88² =
  34. 34.33² =
  35. 35.65² =
  36. 36.92² =
  37. 37.49² =
  38. 38.63² =
  39. 39.71² =
  40. 40.73² =

Answer key

  1. 2025
  2. 1156
  3. 8281
  4. 8649
  5. 4761
  6. 6084
  7. 4096
  8. 6241
  9. 6889
  10. 9604
  11. 5625
  12. 3364
  13. 1225
  14. 4624
  15. 5776
  16. 3249
  17. 1296
  18. 5929
  19. 7921
  20. 9801
  21. 9409
  22. 4489
  23. 3721
  24. 1681
  25. 9025
  26. 3025
  27. 2809
  28. 9216
  29. 7056
  30. 961
  31. 1369
  32. 6561
  33. 7744
  34. 1089
  35. 4225
  36. 8464
  37. 2401
  38. 3969
  39. 5041
  40. 5329

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