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Squares Trick Worksheet

Speed calculation lesson 10: Squares next to a ten · Set 892 · 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. 1.61² =
  2. 2.79² =
  3. 3.69² =
  4. 4.71² =
  5. 5.21² =
  6. 6.71² =
  7. 7.61² =
  8. 8.39² =
  9. 9.39² =
  10. 10.79² =
  11. 11.71² =
  12. 12.69² =
  13. 13.91² =
  14. 14.39² =
  15. 15.79² =
  16. 16.49² =
  17. 17.91² =
  18. 18.69² =
  19. 19.41² =
  20. 20.59² =
  21. 21.41² =
  22. 22.79² =
  23. 23.39² =
  24. 24.89² =
  25. 25.79² =
  26. 26.31² =
  27. 27.51² =
  28. 28.21² =
  29. 29.21² =
  30. 30.31² =
  31. 31.21² =
  32. 32.59² =
  33. 33.21² =
  34. 34.71² =
  35. 35.91² =
  36. 36.81² =
  37. 37.41² =
  38. 38.49² =
  39. 39.41² =
  40. 40.69² =

Answer key

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

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