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Squares Trick Worksheet

Speed calculation lesson 10: Squares next to a ten · Set 925 · 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. 1.59² =
  2. 2.69² =
  3. 3.81² =
  4. 4.51² =
  5. 5.71² =
  6. 6.19² =
  7. 7.79² =
  8. 8.29² =
  9. 9.61² =
  10. 10.81² =
  11. 11.39² =
  12. 12.61² =
  13. 13.29² =
  14. 14.71² =
  15. 15.91² =
  16. 16.19² =
  17. 17.49² =
  18. 18.19² =
  19. 19.39² =
  20. 20.21² =
  21. 21.49² =
  22. 22.91² =
  23. 23.69² =
  24. 24.51² =
  25. 25.19² =
  26. 26.39² =
  27. 27.31² =
  28. 28.81² =
  29. 29.69² =
  30. 30.41² =
  31. 31.59² =
  32. 32.61² =
  33. 33.41² =
  34. 34.91² =
  35. 35.49² =
  36. 36.19² =
  37. 37.41² =
  38. 38.39² =
  39. 39.71² =
  40. 40.81² =

Answer key

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

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