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Squares Trick Worksheet

Speed calculation lesson 10: Squares next to a ten · Set 943 · 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. 2.19² =
  3. 3.31² =
  4. 4.91² =
  5. 5.31² =
  6. 6.89² =
  7. 7.91² =
  8. 8.69² =
  9. 9.49² =
  10. 10.31² =
  11. 11.71² =
  12. 12.51² =
  13. 13.41² =
  14. 14.61² =
  15. 15.29² =
  16. 16.49² =
  17. 17.21² =
  18. 18.79² =
  19. 19.59² =
  20. 20.31² =
  21. 21.79² =
  22. 22.21² =
  23. 23.51² =
  24. 24.59² =
  25. 25.39² =
  26. 26.41² =
  27. 27.39² =
  28. 28.41² =
  29. 29.19² =
  30. 30.79² =
  31. 31.91² =
  32. 32.39² =
  33. 33.51² =
  34. 34.19² =
  35. 35.51² =
  36. 36.91² =
  37. 37.89² =
  38. 38.81² =
  39. 39.91² =
  40. 40.31² =

Answer key

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

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