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Squares Trick Worksheet

Speed calculation lesson 10: Squares next to a ten · Set 902 · 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. 1.51² =
  2. 2.61² =
  3. 3.21² =
  4. 4.69² =
  5. 5.41² =
  6. 6.39² =
  7. 7.39² =
  8. 8.59² =
  9. 9.51² =
  10. 10.21² =
  11. 11.31² =
  12. 12.79² =
  13. 13.39² =
  14. 14.71² =
  15. 15.79² =
  16. 16.69² =
  17. 17.29² =
  18. 18.59² =
  19. 19.89² =
  20. 20.39² =
  21. 21.49² =
  22. 22.51² =
  23. 23.29² =
  24. 24.89² =
  25. 25.79² =
  26. 26.21² =
  27. 27.39² =
  28. 28.41² =
  29. 29.31² =
  30. 30.19² =
  31. 31.61² =
  32. 32.21² =
  33. 33.71² =
  34. 34.29² =
  35. 35.19² =
  36. 36.59² =
  37. 37.91² =
  38. 38.91² =
  39. 39.39² =
  40. 40.69² =

Answer key

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

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