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Squares Trick Worksheet

Speed calculation lesson 10: Squares next to a ten · Set 884 · 40 questions
TalentJR

The fast method (Step from a neighbour): Find the round neighbour and square it: 70² = 7 × 7 = 49, then two 0s → 4900. Ends in 1 (one more)? Add the round number and the number: 4900 + 70 + 71. Ends in 9 (one less)? Take them away: 69² = 4900 − 70 − 69 = 4761.

NameDateTime takenScore ___ / 40
  1. 1.71² =
  2. 2.21² =
  3. 3.79² =
  4. 4.91² =
  5. 5.61² =
  6. 6.39² =
  7. 7.31² =
  8. 8.61² =
  9. 9.29² =
  10. 10.41² =
  11. 11.19² =
  12. 12.21² =
  13. 13.79² =
  14. 14.49² =
  15. 15.41² =
  16. 16.41² =
  17. 17.31² =
  18. 18.61² =
  19. 19.21² =
  20. 20.29² =
  21. 21.61² =
  22. 22.81² =
  23. 23.21² =
  24. 24.89² =
  25. 25.69² =
  26. 26.19² =
  27. 27.79² =
  28. 28.19² =
  29. 29.59² =
  30. 30.21² =
  31. 31.41² =
  32. 32.71² =
  33. 33.51² =
  34. 34.69² =
  35. 35.79² =
  36. 36.79² =
  37. 37.81² =
  38. 38.19² =
  39. 39.59² =
  40. 40.21² =

Answer key

  1. 5041
  2. 441
  3. 6241
  4. 8281
  5. 3721
  6. 1521
  7. 961
  8. 3721
  9. 841
  10. 1681
  11. 361
  12. 441
  13. 6241
  14. 2401
  15. 1681
  16. 1681
  17. 961
  18. 3721
  19. 441
  20. 841
  21. 3721
  22. 6561
  23. 441
  24. 7921
  25. 4761
  26. 361
  27. 6241
  28. 361
  29. 3481
  30. 441
  31. 1681
  32. 5041
  33. 2601
  34. 4761
  35. 6241
  36. 6241
  37. 6561
  38. 361
  39. 3481
  40. 441

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