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Squares Trick Worksheet

Speed calculation lesson 10: Squares next to a ten · Set 910 · 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. 1.39² =
  2. 2.89² =
  3. 3.71² =
  4. 4.71² =
  5. 5.49² =
  6. 6.19² =
  7. 7.81² =
  8. 8.69² =
  9. 9.29² =
  10. 10.19² =
  11. 11.51² =
  12. 12.29² =
  13. 13.89² =
  14. 14.41² =
  15. 15.91² =
  16. 16.51² =
  17. 17.41² =
  18. 18.19² =
  19. 19.81² =
  20. 20.89² =
  21. 21.51² =
  22. 22.89² =
  23. 23.59² =
  24. 24.51² =
  25. 25.39² =
  26. 26.69² =
  27. 27.69² =
  28. 28.51² =
  29. 29.29² =
  30. 30.91² =
  31. 31.81² =
  32. 32.61² =
  33. 33.91² =
  34. 34.51² =
  35. 35.21² =
  36. 36.81² =
  37. 37.89² =
  38. 38.39² =
  39. 39.31² =
  40. 40.79² =

Answer key

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

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