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Squares Trick Worksheet

Speed calculation lesson 10: Squares next to a ten · Set 984 · 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. 1.91² =
  2. 2.59² =
  3. 3.89² =
  4. 4.39² =
  5. 5.31² =
  6. 6.61² =
  7. 7.79² =
  8. 8.69² =
  9. 9.19² =
  10. 10.81² =
  11. 11.49² =
  12. 12.79² =
  13. 13.51² =
  14. 14.69² =
  15. 15.29² =
  16. 16.39² =
  17. 17.29² =
  18. 18.69² =
  19. 19.19² =
  20. 20.51² =
  21. 21.79² =
  22. 22.39² =
  23. 23.79² =
  24. 24.29² =
  25. 25.71² =
  26. 26.91² =
  27. 27.59² =
  28. 28.79² =
  29. 29.39² =
  30. 30.21² =
  31. 31.41² =
  32. 32.39² =
  33. 33.19² =
  34. 34.19² =
  35. 35.59² =
  36. 36.39² =
  37. 37.39² =
  38. 38.29² =
  39. 39.81² =
  40. 40.81² =

Answer key

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

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