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Squaring 2-Digit Numbers Mentally Worksheet

Mental maths lesson 23: Square any 2-digit number: up and down · Set 394 · 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. 1.89² =
  2. 2.81² =
  3. 3.69² =
  4. 4.32² =
  5. 5.78² =
  6. 6.48² =
  7. 7.59² =
  8. 8.96² =
  9. 9.31² =
  10. 10.62² =
  11. 11.64² =
  12. 12.58² =
  13. 13.36² =
  14. 14.95² =
  15. 15.55² =
  16. 16.41² =
  17. 17.71² =
  18. 18.63² =
  19. 19.51² =
  20. 20.91² =
  21. 21.56² =
  22. 22.99² =
  23. 23.83² =
  24. 24.93² =
  25. 25.47² =
  26. 26.98² =
  27. 27.42² =
  28. 28.72² =
  29. 29.88² =
  30. 30.49² =
  31. 31.43² =
  32. 32.77² =
  33. 33.79² =
  34. 34.75² =
  35. 35.66² =
  36. 36.39² =
  37. 37.38² =
  38. 38.85² =
  39. 39.97² =
  40. 40.35² =

Answer key

  1. 7921
  2. 6561
  3. 4761
  4. 1024
  5. 6084
  6. 2304
  7. 3481
  8. 9216
  9. 961
  10. 3844
  11. 4096
  12. 3364
  13. 1296
  14. 9025
  15. 3025
  16. 1681
  17. 5041
  18. 3969
  19. 2601
  20. 8281
  21. 3136
  22. 9801
  23. 6889
  24. 8649
  25. 2209
  26. 9604
  27. 1764
  28. 5184
  29. 7744
  30. 2401
  31. 1849
  32. 5929
  33. 6241
  34. 5625
  35. 4356
  36. 1521
  37. 1444
  38. 7225
  39. 9409
  40. 1225

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