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Squaring 2-Digit Numbers Mentally Worksheet

Mental maths lesson 23: Square any 2-digit number: up and down · Set 900 · 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. 2.49² =
  3. 3.91² =
  4. 4.66² =
  5. 5.63² =
  6. 6.42² =
  7. 7.84² =
  8. 8.81² =
  9. 9.69² =
  10. 10.32² =
  11. 11.51² =
  12. 12.48² =
  13. 13.62² =
  14. 14.75² =
  15. 15.58² =
  16. 16.97² =
  17. 17.73² =
  18. 18.57² =
  19. 19.47² =
  20. 20.56² =
  21. 21.83² =
  22. 22.53² =
  23. 23.93² =
  24. 24.92² =
  25. 25.31² =
  26. 26.41² =
  27. 27.61² =
  28. 28.98² =
  29. 29.39² =
  30. 30.45² =
  31. 31.96² =
  32. 32.72² =
  33. 33.52² =
  34. 34.77² =
  35. 35.33² =
  36. 36.68² =
  37. 37.79² =
  38. 38.64² =
  39. 39.82² =
  40. 40.76² =

Answer key

  1. 7921
  2. 2401
  3. 8281
  4. 4356
  5. 3969
  6. 1764
  7. 7056
  8. 6561
  9. 4761
  10. 1024
  11. 2601
  12. 2304
  13. 3844
  14. 5625
  15. 3364
  16. 9409
  17. 5329
  18. 3249
  19. 2209
  20. 3136
  21. 6889
  22. 2809
  23. 8649
  24. 8464
  25. 961
  26. 1681
  27. 3721
  28. 9604
  29. 1521
  30. 2025
  31. 9216
  32. 5184
  33. 2704
  34. 5929
  35. 1089
  36. 4624
  37. 6241
  38. 4096
  39. 6724
  40. 5776

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