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Squaring 2-Digit Numbers Mentally Worksheet

Mental maths lesson 23: Square any 2-digit number: up and down · Set 136 · 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. 1.64² =
  2. 2.58² =
  3. 3.32² =
  4. 4.57² =
  5. 5.78² =
  6. 6.51² =
  7. 7.49² =
  8. 8.59² =
  9. 9.98² =
  10. 10.92² =
  11. 11.45² =
  12. 12.72² =
  13. 13.84² =
  14. 14.68² =
  15. 15.86² =
  16. 16.76² =
  17. 17.89² =
  18. 18.53² =
  19. 19.63² =
  20. 20.36² =
  21. 21.42² =
  22. 22.65² =
  23. 23.79² =
  24. 24.39² =
  25. 25.56² =
  26. 26.96² =
  27. 27.82² =
  28. 28.55² =
  29. 29.91² =
  30. 30.41² =
  31. 31.44² =
  32. 32.33² =
  33. 33.85² =
  34. 34.83² =
  35. 35.74² =
  36. 36.73² =
  37. 37.71² =
  38. 38.46² =
  39. 39.94² =
  40. 40.34² =

Answer key

  1. 4096
  2. 3364
  3. 1024
  4. 3249
  5. 6084
  6. 2601
  7. 2401
  8. 3481
  9. 9604
  10. 8464
  11. 2025
  12. 5184
  13. 7056
  14. 4624
  15. 7396
  16. 5776
  17. 7921
  18. 2809
  19. 3969
  20. 1296
  21. 1764
  22. 4225
  23. 6241
  24. 1521
  25. 3136
  26. 9216
  27. 6724
  28. 3025
  29. 8281
  30. 1681
  31. 1936
  32. 1089
  33. 7225
  34. 6889
  35. 5476
  36. 5329
  37. 5041
  38. 2116
  39. 8836
  40. 1156

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