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Squares Trick Worksheet

Speed calculation lesson 10: Squares next to a ten · Set 885 · 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. 1.31² =
  2. 2.71² =
  3. 3.69² =
  4. 4.51² =
  5. 5.69² =
  6. 6.19² =
  7. 7.89² =
  8. 8.51² =
  9. 9.71² =
  10. 10.29² =
  11. 11.91² =
  12. 12.71² =
  13. 13.21² =
  14. 14.31² =
  15. 15.71² =
  16. 16.31² =
  17. 17.91² =
  18. 18.79² =
  19. 19.31² =
  20. 20.89² =
  21. 21.79² =
  22. 22.29² =
  23. 23.51² =
  24. 24.91² =
  25. 25.59² =
  26. 26.49² =
  27. 27.79² =
  28. 28.39² =
  29. 29.71² =
  30. 30.19² =
  31. 31.49² =
  32. 32.61² =
  33. 33.21² =
  34. 34.29² =
  35. 35.91² =
  36. 36.89² =
  37. 37.39² =
  38. 38.69² =
  39. 39.21² =
  40. 40.41² =

Answer key

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

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