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Squaring 2-Digit Numbers Mentally Worksheet

Mental maths lesson 23: Square any 2-digit number: up and down · Set 330 · 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. 2.76² =
  3. 3.61² =
  4. 4.51² =
  5. 5.44² =
  6. 6.41² =
  7. 7.91² =
  8. 8.59² =
  9. 9.93² =
  10. 10.54² =
  11. 11.38² =
  12. 12.86² =
  13. 13.69² =
  14. 14.62² =
  15. 15.33² =
  16. 16.66² =
  17. 17.53² =
  18. 18.31² =
  19. 19.37² =
  20. 20.96² =
  21. 21.75² =
  22. 22.57² =
  23. 23.64² =
  24. 24.81² =
  25. 25.89² =
  26. 26.72² =
  27. 27.32² =
  28. 28.85² =
  29. 29.98² =
  30. 30.58² =
  31. 31.34² =
  32. 32.94² =
  33. 33.74² =
  34. 34.56² =
  35. 35.36² =
  36. 36.95² =
  37. 37.48² =
  38. 38.63² =
  39. 39.65² =
  40. 40.84² =

Answer key

  1. 1764
  2. 5776
  3. 3721
  4. 2601
  5. 1936
  6. 1681
  7. 8281
  8. 3481
  9. 8649
  10. 2916
  11. 1444
  12. 7396
  13. 4761
  14. 3844
  15. 1089
  16. 4356
  17. 2809
  18. 961
  19. 1369
  20. 9216
  21. 5625
  22. 3249
  23. 4096
  24. 6561
  25. 7921
  26. 5184
  27. 1024
  28. 7225
  29. 9604
  30. 3364
  31. 1156
  32. 8836
  33. 5476
  34. 3136
  35. 1296
  36. 9025
  37. 2304
  38. 3969
  39. 4225
  40. 7056

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