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Squares Trick Worksheet

Speed calculation lesson 10: Squares next to a ten · Set 891 · 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. 1.71² =
  2. 2.71² =
  3. 3.79² =
  4. 4.41² =
  5. 5.21² =
  6. 6.21² =
  7. 7.49² =
  8. 8.41² =
  9. 9.39² =
  10. 10.59² =
  11. 11.79² =
  12. 12.89² =
  13. 13.59² =
  14. 14.69² =
  15. 15.89² =
  16. 16.49² =
  17. 17.31² =
  18. 18.61² =
  19. 19.49² =
  20. 20.59² =
  21. 21.29² =
  22. 22.41² =
  23. 23.59² =
  24. 24.59² =
  25. 25.71² =
  26. 26.41² =
  27. 27.31² =
  28. 28.29² =
  29. 29.51² =
  30. 30.59² =
  31. 31.41² =
  32. 32.69² =
  33. 33.51² =
  34. 34.89² =
  35. 35.19² =
  36. 36.89² =
  37. 37.49² =
  38. 38.61² =
  39. 39.49² =
  40. 40.91² =

Answer key

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

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