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Squaring 2-Digit Numbers Mentally Worksheet

Mental maths lesson 23: Square any 2-digit number: up and down · Set 308 · 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. 1.58² =
  2. 2.52² =
  3. 3.78² =
  4. 4.93² =
  5. 5.34² =
  6. 6.65² =
  7. 7.31² =
  8. 8.57² =
  9. 9.89² =
  10. 10.51² =
  11. 11.68² =
  12. 12.98² =
  13. 13.71² =
  14. 14.61² =
  15. 15.54² =
  16. 16.83² =
  17. 17.99² =
  18. 18.36² =
  19. 19.41² =
  20. 20.79² =
  21. 21.77² =
  22. 22.86² =
  23. 23.45² =
  24. 24.64² =
  25. 25.94² =
  26. 26.91² =
  27. 27.87² =
  28. 28.81² =
  29. 29.96² =
  30. 30.46² =
  31. 31.66² =
  32. 32.85² =
  33. 33.76² =
  34. 34.49² =
  35. 35.92² =
  36. 36.39² =
  37. 37.62² =
  38. 38.53² =
  39. 39.56² =
  40. 40.75² =

Answer key

  1. 3364
  2. 2704
  3. 6084
  4. 8649
  5. 1156
  6. 4225
  7. 961
  8. 3249
  9. 7921
  10. 2601
  11. 4624
  12. 9604
  13. 5041
  14. 3721
  15. 2916
  16. 6889
  17. 9801
  18. 1296
  19. 1681
  20. 6241
  21. 5929
  22. 7396
  23. 2025
  24. 4096
  25. 8836
  26. 8281
  27. 7569
  28. 6561
  29. 9216
  30. 2116
  31. 4356
  32. 7225
  33. 5776
  34. 2401
  35. 8464
  36. 1521
  37. 3844
  38. 2809
  39. 3136
  40. 5625

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