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Squaring 2-Digit Numbers Mentally Worksheet

Mental maths lesson 23: Square any 2-digit number: up and down · Set 203 · 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. 1.49² =
  2. 2.83² =
  3. 3.34² =
  4. 4.52² =
  5. 5.33² =
  6. 6.37² =
  7. 7.43² =
  8. 8.82² =
  9. 9.93² =
  10. 10.47² =
  11. 11.92² =
  12. 12.88² =
  13. 13.84² =
  14. 14.87² =
  15. 15.46² =
  16. 16.95² =
  17. 17.66² =
  18. 18.31² =
  19. 19.42² =
  20. 20.74² =
  21. 21.35² =
  22. 22.51² =
  23. 23.54² =
  24. 24.98² =
  25. 25.61² =
  26. 26.58² =
  27. 27.96² =
  28. 28.53² =
  29. 29.64² =
  30. 30.72² =
  31. 31.65² =
  32. 32.41² =
  33. 33.71² =
  34. 34.69² =
  35. 35.36² =
  36. 36.63² =
  37. 37.62² =
  38. 38.97² =
  39. 39.68² =
  40. 40.57² =

Answer key

  1. 2401
  2. 6889
  3. 1156
  4. 2704
  5. 1089
  6. 1369
  7. 1849
  8. 6724
  9. 8649
  10. 2209
  11. 8464
  12. 7744
  13. 7056
  14. 7569
  15. 2116
  16. 9025
  17. 4356
  18. 961
  19. 1764
  20. 5476
  21. 1225
  22. 2601
  23. 2916
  24. 9604
  25. 3721
  26. 3364
  27. 9216
  28. 2809
  29. 4096
  30. 5184
  31. 4225
  32. 1681
  33. 5041
  34. 4761
  35. 1296
  36. 3969
  37. 3844
  38. 9409
  39. 4624
  40. 3249

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