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Squaring 2-Digit Numbers Mentally Worksheet

Mental maths lesson 23: Square any 2-digit number: up and down · Set 54 · 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. 1.41² =
  2. 2.38² =
  3. 3.62² =
  4. 4.85² =
  5. 5.59² =
  6. 6.61² =
  7. 7.43² =
  8. 8.87² =
  9. 9.99² =
  10. 10.47² =
  11. 11.71² =
  12. 12.33² =
  13. 13.81² =
  14. 14.52² =
  15. 15.89² =
  16. 16.44² =
  17. 17.55² =
  18. 18.93² =
  19. 19.73² =
  20. 20.32² =
  21. 21.91² =
  22. 22.36² =
  23. 23.37² =
  24. 24.98² =
  25. 25.68² =
  26. 26.45² =
  27. 27.67² =
  28. 28.95² =
  29. 29.74² =
  30. 30.31² =
  31. 31.84² =
  32. 32.39² =
  33. 33.53² =
  34. 34.51² =
  35. 35.92² =
  36. 36.66² =
  37. 37.63² =
  38. 38.35² =
  39. 39.58² =
  40. 40.34² =

Answer key

  1. 1681
  2. 1444
  3. 3844
  4. 7225
  5. 3481
  6. 3721
  7. 1849
  8. 7569
  9. 9801
  10. 2209
  11. 5041
  12. 1089
  13. 6561
  14. 2704
  15. 7921
  16. 1936
  17. 3025
  18. 8649
  19. 5329
  20. 1024
  21. 8281
  22. 1296
  23. 1369
  24. 9604
  25. 4624
  26. 2025
  27. 4489
  28. 9025
  29. 5476
  30. 961
  31. 7056
  32. 1521
  33. 2809
  34. 2601
  35. 8464
  36. 4356
  37. 3969
  38. 1225
  39. 3364
  40. 1156

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