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Squares Trick Worksheet

Speed calculation lesson 10: Squares next to a ten · Set 993 · 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. 1.81² =
  2. 2.19² =
  3. 3.31² =
  4. 4.51² =
  5. 5.79² =
  6. 6.91² =
  7. 7.39² =
  8. 8.41² =
  9. 9.61² =
  10. 10.39² =
  11. 11.91² =
  12. 12.31² =
  13. 13.71² =
  14. 14.49² =
  15. 15.39² =
  16. 16.59² =
  17. 17.49² =
  18. 18.31² =
  19. 19.61² =
  20. 20.31² =
  21. 21.81² =
  22. 22.59² =
  23. 23.59² =
  24. 24.29² =
  25. 25.59² =
  26. 26.61² =
  27. 27.31² =
  28. 28.69² =
  29. 29.51² =
  30. 30.79² =
  31. 31.41² =
  32. 32.79² =
  33. 33.39² =
  34. 34.79² =
  35. 35.91² =
  36. 36.19² =
  37. 37.39² =
  38. 38.79² =
  39. 39.31² =
  40. 40.31² =

Answer key

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

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