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Squaring 2-Digit Numbers Mentally Worksheet

Mental maths lesson 23: Square any 2-digit number: up and down · Set 300 · 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. 1.55² =
  2. 2.81² =
  3. 3.96² =
  4. 4.36² =
  5. 5.58² =
  6. 6.97² =
  7. 7.48² =
  8. 8.47² =
  9. 9.87² =
  10. 10.62² =
  11. 11.43² =
  12. 12.49² =
  13. 13.61² =
  14. 14.63² =
  15. 15.82² =
  16. 16.93² =
  17. 17.38² =
  18. 18.32² =
  19. 19.41² =
  20. 20.42² =
  21. 21.84² =
  22. 22.57² =
  23. 23.66² =
  24. 24.56² =
  25. 25.35² =
  26. 26.67² =
  27. 27.34² =
  28. 28.99² =
  29. 29.89² =
  30. 30.92² =
  31. 31.44² =
  32. 32.94² =
  33. 33.78² =
  34. 34.95² =
  35. 35.71² =
  36. 36.59² =
  37. 37.51² =
  38. 38.77² =
  39. 39.33² =
  40. 40.53² =

Answer key

  1. 3025
  2. 6561
  3. 9216
  4. 1296
  5. 3364
  6. 9409
  7. 2304
  8. 2209
  9. 7569
  10. 3844
  11. 1849
  12. 2401
  13. 3721
  14. 3969
  15. 6724
  16. 8649
  17. 1444
  18. 1024
  19. 1681
  20. 1764
  21. 7056
  22. 3249
  23. 4356
  24. 3136
  25. 1225
  26. 4489
  27. 1156
  28. 9801
  29. 7921
  30. 8464
  31. 1936
  32. 8836
  33. 6084
  34. 9025
  35. 5041
  36. 3481
  37. 2601
  38. 5929
  39. 1089
  40. 2809

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