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Squaring 2-Digit Numbers Mentally Worksheet

Mental maths lesson 23: Square any 2-digit number: up and down · Set 544 · 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. 1.42² =
  2. 2.78² =
  3. 3.81² =
  4. 4.99² =
  5. 5.61² =
  6. 6.64² =
  7. 7.47² =
  8. 8.56² =
  9. 9.53² =
  10. 10.45² =
  11. 11.94² =
  12. 12.69² =
  13. 13.38² =
  14. 14.48² =
  15. 15.77² =
  16. 16.72² =
  17. 17.58² =
  18. 18.52² =
  19. 19.41² =
  20. 20.68² =
  21. 21.49² =
  22. 22.79² =
  23. 23.71² =
  24. 24.97² =
  25. 25.83² =
  26. 26.87² =
  27. 27.95² =
  28. 28.51² =
  29. 29.35² =
  30. 30.31² =
  31. 31.32² =
  32. 32.92² =
  33. 33.59² =
  34. 34.39² =
  35. 35.73² =
  36. 36.93² =
  37. 37.85² =
  38. 38.46² =
  39. 39.65² =
  40. 40.54² =

Answer key

  1. 1764
  2. 6084
  3. 6561
  4. 9801
  5. 3721
  6. 4096
  7. 2209
  8. 3136
  9. 2809
  10. 2025
  11. 8836
  12. 4761
  13. 1444
  14. 2304
  15. 5929
  16. 5184
  17. 3364
  18. 2704
  19. 1681
  20. 4624
  21. 2401
  22. 6241
  23. 5041
  24. 9409
  25. 6889
  26. 7569
  27. 9025
  28. 2601
  29. 1225
  30. 961
  31. 1024
  32. 8464
  33. 3481
  34. 1521
  35. 5329
  36. 8649
  37. 7225
  38. 2116
  39. 4225
  40. 2916

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