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Squaring 2-Digit Numbers Mentally Worksheet

Mental maths lesson 23: Square any 2-digit number: up and down · Set 340 · 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. 1.97² =
  2. 2.58² =
  3. 3.84² =
  4. 4.86² =
  5. 5.44² =
  6. 6.71² =
  7. 7.95² =
  8. 8.79² =
  9. 9.81² =
  10. 10.73² =
  11. 11.69² =
  12. 12.36² =
  13. 13.31² =
  14. 14.57² =
  15. 15.91² =
  16. 16.89² =
  17. 17.41² =
  18. 18.65² =
  19. 19.54² =
  20. 20.94² =
  21. 21.42² =
  22. 22.88² =
  23. 23.63² =
  24. 24.64² =
  25. 25.62² =
  26. 26.87² =
  27. 27.66² =
  28. 28.59² =
  29. 29.32² =
  30. 30.68² =
  31. 31.92² =
  32. 32.33² =
  33. 33.55² =
  34. 34.53² =
  35. 35.61² =
  36. 36.98² =
  37. 37.43² =
  38. 38.72² =
  39. 39.77² =
  40. 40.47² =

Answer key

  1. 9409
  2. 3364
  3. 7056
  4. 7396
  5. 1936
  6. 5041
  7. 9025
  8. 6241
  9. 6561
  10. 5329
  11. 4761
  12. 1296
  13. 961
  14. 3249
  15. 8281
  16. 7921
  17. 1681
  18. 4225
  19. 2916
  20. 8836
  21. 1764
  22. 7744
  23. 3969
  24. 4096
  25. 3844
  26. 7569
  27. 4356
  28. 3481
  29. 1024
  30. 4624
  31. 8464
  32. 1089
  33. 3025
  34. 2809
  35. 3721
  36. 9604
  37. 1849
  38. 5184
  39. 5929
  40. 2209

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