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Squares Trick Worksheet

Speed calculation lesson 10: Squares next to a ten · Set 948 · 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. 2.79² =
  3. 3.31² =
  4. 4.51² =
  5. 5.89² =
  6. 6.81² =
  7. 7.21² =
  8. 8.81² =
  9. 9.71² =
  10. 10.31² =
  11. 11.49² =
  12. 12.81² =
  13. 13.81² =
  14. 14.71² =
  15. 15.41² =
  16. 16.61² =
  17. 17.39² =
  18. 18.39² =
  19. 19.59² =
  20. 20.49² =
  21. 21.19² =
  22. 22.39² =
  23. 23.59² =
  24. 24.19² =
  25. 25.29² =
  26. 26.51² =
  27. 27.41² =
  28. 28.91² =
  29. 29.59² =
  30. 30.59² =
  31. 31.29² =
  32. 32.51² =
  33. 33.89² =
  34. 34.59² =
  35. 35.79² =
  36. 36.69² =
  37. 37.31² =
  38. 38.49² =
  39. 39.81² =
  40. 40.39² =

Answer key

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

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