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Squaring 2-Digit Numbers Mentally Worksheet

Mental maths lesson 23: Square any 2-digit number: up and down · Set 644 · 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. 1.36² =
  2. 2.93² =
  3. 3.34² =
  4. 4.85² =
  5. 5.54² =
  6. 6.45² =
  7. 7.98² =
  8. 8.35² =
  9. 9.41² =
  10. 10.58² =
  11. 11.95² =
  12. 12.52² =
  13. 13.65² =
  14. 14.92² =
  15. 15.91² =
  16. 16.89² =
  17. 17.49² =
  18. 18.99² =
  19. 19.81² =
  20. 20.59² =
  21. 21.39² =
  22. 22.61² =
  23. 23.33² =
  24. 24.53² =
  25. 25.88² =
  26. 26.38² =
  27. 27.55² =
  28. 28.51² =
  29. 29.71² =
  30. 30.46² =
  31. 31.48² =
  32. 32.57² =
  33. 33.37² =
  34. 34.73² =
  35. 35.62² =
  36. 36.84² =
  37. 37.83² =
  38. 38.31² =
  39. 39.75² =
  40. 40.68² =

Answer key

  1. 1296
  2. 8649
  3. 1156
  4. 7225
  5. 2916
  6. 2025
  7. 9604
  8. 1225
  9. 1681
  10. 3364
  11. 9025
  12. 2704
  13. 4225
  14. 8464
  15. 8281
  16. 7921
  17. 2401
  18. 9801
  19. 6561
  20. 3481
  21. 1521
  22. 3721
  23. 1089
  24. 2809
  25. 7744
  26. 1444
  27. 3025
  28. 2601
  29. 5041
  30. 2116
  31. 2304
  32. 3249
  33. 1369
  34. 5329
  35. 3844
  36. 7056
  37. 6889
  38. 961
  39. 5625
  40. 4624

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