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Squaring 2-Digit Numbers Mentally Worksheet

Mental maths lesson 23: Square any 2-digit number: up and down · Set 76 · 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. 1.89² =
  2. 2.51² =
  3. 3.66² =
  4. 4.42² =
  5. 5.35² =
  6. 6.45² =
  7. 7.71² =
  8. 8.93² =
  9. 9.61² =
  10. 10.76² =
  11. 11.92² =
  12. 12.84² =
  13. 13.62² =
  14. 14.83² =
  15. 15.56² =
  16. 16.31² =
  17. 17.52² =
  18. 18.81² =
  19. 19.39² =
  20. 20.32² =
  21. 21.38² =
  22. 22.33² =
  23. 23.68² =
  24. 24.41² =
  25. 25.77² =
  26. 26.87² =
  27. 27.65² =
  28. 28.47² =
  29. 29.79² =
  30. 30.91² =
  31. 31.98² =
  32. 32.48² =
  33. 33.96² =
  34. 34.74² =
  35. 35.55² =
  36. 36.57² =
  37. 37.63² =
  38. 38.95² =
  39. 39.75² =
  40. 40.36² =

Answer key

  1. 7921
  2. 2601
  3. 4356
  4. 1764
  5. 1225
  6. 2025
  7. 5041
  8. 8649
  9. 3721
  10. 5776
  11. 8464
  12. 7056
  13. 3844
  14. 6889
  15. 3136
  16. 961
  17. 2704
  18. 6561
  19. 1521
  20. 1024
  21. 1444
  22. 1089
  23. 4624
  24. 1681
  25. 5929
  26. 7569
  27. 4225
  28. 2209
  29. 6241
  30. 8281
  31. 9604
  32. 2304
  33. 9216
  34. 5476
  35. 3025
  36. 3249
  37. 3969
  38. 9025
  39. 5625
  40. 1296

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