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Squaring 2-Digit Numbers Mentally Worksheet

Mental maths lesson 23: Square any 2-digit number: up and down · Set 595 · 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. 1.62² =
  2. 2.77² =
  3. 3.43² =
  4. 4.51² =
  5. 5.91² =
  6. 6.96² =
  7. 7.31² =
  8. 8.32² =
  9. 9.33² =
  10. 10.47² =
  11. 11.42² =
  12. 12.61² =
  13. 13.67² =
  14. 14.83² =
  15. 15.59² =
  16. 16.66² =
  17. 17.41² =
  18. 18.78² =
  19. 19.84² =
  20. 20.55² =
  21. 21.44² =
  22. 22.49² =
  23. 23.97² =
  24. 24.68² =
  25. 25.48² =
  26. 26.95² =
  27. 27.38² =
  28. 28.52² =
  29. 29.89² =
  30. 30.76² =
  31. 31.45² =
  32. 32.63² =
  33. 33.58² =
  34. 34.98² =
  35. 35.69² =
  36. 36.39² =
  37. 37.71² =
  38. 38.36² =
  39. 39.93² =
  40. 40.53² =

Answer key

  1. 3844
  2. 5929
  3. 1849
  4. 2601
  5. 8281
  6. 9216
  7. 961
  8. 1024
  9. 1089
  10. 2209
  11. 1764
  12. 3721
  13. 4489
  14. 6889
  15. 3481
  16. 4356
  17. 1681
  18. 6084
  19. 7056
  20. 3025
  21. 1936
  22. 2401
  23. 9409
  24. 4624
  25. 2304
  26. 9025
  27. 1444
  28. 2704
  29. 7921
  30. 5776
  31. 2025
  32. 3969
  33. 3364
  34. 9604
  35. 4761
  36. 1521
  37. 5041
  38. 1296
  39. 8649
  40. 2809

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