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Squaring 2-Digit Numbers Mentally Worksheet

Mental maths lesson 23: Square any 2-digit number: up and down · Set 744 · 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. 1.69² =
  2. 2.58² =
  3. 3.96² =
  4. 4.59² =
  5. 5.87² =
  6. 6.65² =
  7. 7.94² =
  8. 8.71² =
  9. 9.79² =
  10. 10.97² =
  11. 11.32² =
  12. 12.57² =
  13. 13.93² =
  14. 14.73² =
  15. 15.91² =
  16. 16.43² =
  17. 17.84² =
  18. 18.61² =
  19. 19.62² =
  20. 20.46² =
  21. 21.63² =
  22. 22.92² =
  23. 23.36² =
  24. 24.51² =
  25. 25.75² =
  26. 26.85² =
  27. 27.41² =
  28. 28.86² =
  29. 29.44² =
  30. 30.66² =
  31. 31.78² =
  32. 32.35² =
  33. 33.54² =
  34. 34.55² =
  35. 35.42² =
  36. 36.64² =
  37. 37.33² =
  38. 38.34² =
  39. 39.67² =
  40. 40.38² =

Answer key

  1. 4761
  2. 3364
  3. 9216
  4. 3481
  5. 7569
  6. 4225
  7. 8836
  8. 5041
  9. 6241
  10. 9409
  11. 1024
  12. 3249
  13. 8649
  14. 5329
  15. 8281
  16. 1849
  17. 7056
  18. 3721
  19. 3844
  20. 2116
  21. 3969
  22. 8464
  23. 1296
  24. 2601
  25. 5625
  26. 7225
  27. 1681
  28. 7396
  29. 1936
  30. 4356
  31. 6084
  32. 1225
  33. 2916
  34. 3025
  35. 1764
  36. 4096
  37. 1089
  38. 1156
  39. 4489
  40. 1444

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