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Squaring 2-Digit Numbers Mentally Worksheet

Mental maths lesson 23: Square any 2-digit number: up and down · Set 800 · 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. 1.65² =
  2. 2.71² =
  3. 3.91² =
  4. 4.31² =
  5. 5.37² =
  6. 6.47² =
  7. 7.63² =
  8. 8.39² =
  9. 9.69² =
  10. 10.93² =
  11. 11.86² =
  12. 12.64² =
  13. 13.34² =
  14. 14.49² =
  15. 15.89² =
  16. 16.41² =
  17. 17.44² =
  18. 18.55² =
  19. 19.98² =
  20. 20.46² =
  21. 21.84² =
  22. 22.51² =
  23. 23.32² =
  24. 24.42² =
  25. 25.59² =
  26. 26.83² =
  27. 27.87² =
  28. 28.67² =
  29. 29.68² =
  30. 30.35² =
  31. 31.45² =
  32. 32.94² =
  33. 33.79² =
  34. 34.58² =
  35. 35.57² =
  36. 36.76² =
  37. 37.73² =
  38. 38.97² =
  39. 39.54² =
  40. 40.77² =

Answer key

  1. 4225
  2. 5041
  3. 8281
  4. 961
  5. 1369
  6. 2209
  7. 3969
  8. 1521
  9. 4761
  10. 8649
  11. 7396
  12. 4096
  13. 1156
  14. 2401
  15. 7921
  16. 1681
  17. 1936
  18. 3025
  19. 9604
  20. 2116
  21. 7056
  22. 2601
  23. 1024
  24. 1764
  25. 3481
  26. 6889
  27. 7569
  28. 4489
  29. 4624
  30. 1225
  31. 2025
  32. 8836
  33. 6241
  34. 3364
  35. 3249
  36. 5776
  37. 5329
  38. 9409
  39. 2916
  40. 5929

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