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Squares Trick Worksheet

Speed calculation lesson 10: Squares next to a ten · Set 900 · 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. 1.69² =
  2. 2.81² =
  3. 3.61² =
  4. 4.71² =
  5. 5.29² =
  6. 6.79² =
  7. 7.29² =
  8. 8.41² =
  9. 9.69² =
  10. 10.51² =
  11. 11.41² =
  12. 12.31² =
  13. 13.31² =
  14. 14.21² =
  15. 15.81² =
  16. 16.61² =
  17. 17.61² =
  18. 18.81² =
  19. 19.59² =
  20. 20.71² =
  21. 21.21² =
  22. 22.41² =
  23. 23.71² =
  24. 24.29² =
  25. 25.89² =
  26. 26.59² =
  27. 27.59² =
  28. 28.79² =
  29. 29.21² =
  30. 30.79² =
  31. 31.39² =
  32. 32.31² =
  33. 33.19² =
  34. 34.59² =
  35. 35.41² =
  36. 36.21² =
  37. 37.29² =
  38. 38.51² =
  39. 39.41² =
  40. 40.59² =

Answer key

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

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