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Squares Trick Worksheet

Speed calculation lesson 10: Squares next to a ten · Set 953 · 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. 1.79² =
  2. 2.79² =
  3. 3.79² =
  4. 4.21² =
  5. 5.29² =
  6. 6.79² =
  7. 7.81² =
  8. 8.89² =
  9. 9.39² =
  10. 10.69² =
  11. 11.61² =
  12. 12.61² =
  13. 13.59² =
  14. 14.41² =
  15. 15.81² =
  16. 16.41² =
  17. 17.19² =
  18. 18.89² =
  19. 19.29² =
  20. 20.39² =
  21. 21.91² =
  22. 22.21² =
  23. 23.39² =
  24. 24.31² =
  25. 25.59² =
  26. 26.29² =
  27. 27.51² =
  28. 28.81² =
  29. 29.49² =
  30. 30.91² =
  31. 31.51² =
  32. 32.19² =
  33. 33.61² =
  34. 34.21² =
  35. 35.31² =
  36. 36.71² =
  37. 37.41² =
  38. 38.19² =
  39. 39.91² =
  40. 40.31² =

Answer key

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

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