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Squaring 2-Digit Numbers Mentally Worksheet

Mental maths lesson 23: Square any 2-digit number: up and down · Set 586 · 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. 1.32² =
  2. 2.98² =
  3. 3.63² =
  4. 4.61² =
  5. 5.92² =
  6. 6.82² =
  7. 7.91² =
  8. 8.74² =
  9. 9.71² =
  10. 10.65² =
  11. 11.56² =
  12. 12.89² =
  13. 13.37² =
  14. 14.42² =
  15. 15.38² =
  16. 16.64² =
  17. 17.77² =
  18. 18.57² =
  19. 19.94² =
  20. 20.78² =
  21. 21.44² =
  22. 22.48² =
  23. 23.49² =
  24. 24.93² =
  25. 25.62² =
  26. 26.72² =
  27. 27.54² =
  28. 28.75² =
  29. 29.59² =
  30. 30.52² =
  31. 31.51² =
  32. 32.36² =
  33. 33.79² =
  34. 34.41² =
  35. 35.58² =
  36. 36.83² =
  37. 37.86² =
  38. 38.95² =
  39. 39.56² =
  40. 40.66² =

Answer key

  1. 1024
  2. 9604
  3. 3969
  4. 3721
  5. 8464
  6. 6724
  7. 8281
  8. 5476
  9. 5041
  10. 4225
  11. 3136
  12. 7921
  13. 1369
  14. 1764
  15. 1444
  16. 4096
  17. 5929
  18. 3249
  19. 8836
  20. 6084
  21. 1936
  22. 2304
  23. 2401
  24. 8649
  25. 3844
  26. 5184
  27. 2916
  28. 5625
  29. 3481
  30. 2704
  31. 2601
  32. 1296
  33. 6241
  34. 1681
  35. 3364
  36. 6889
  37. 7396
  38. 9025
  39. 3136
  40. 4356

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