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Squares Trick Worksheet

Speed calculation lesson 10: Squares next to a ten · Set 917 · 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. 2.71² =
  3. 3.51² =
  4. 4.31² =
  5. 5.31² =
  6. 6.81² =
  7. 7.51² =
  8. 8.21² =
  9. 9.29² =
  10. 10.31² =
  11. 11.39² =
  12. 12.41² =
  13. 13.79² =
  14. 14.19² =
  15. 15.29² =
  16. 16.59² =
  17. 17.49² =
  18. 18.81² =
  19. 19.19² =
  20. 20.79² =
  21. 21.49² =
  22. 22.91² =
  23. 23.29² =
  24. 24.31² =
  25. 25.49² =
  26. 26.89² =
  27. 27.69² =
  28. 28.69² =
  29. 29.29² =
  30. 30.89² =
  31. 31.91² =
  32. 32.51² =
  33. 33.41² =
  34. 34.61² =
  35. 35.29² =
  36. 36.31² =
  37. 37.89² =
  38. 38.39² =
  39. 39.51² =
  40. 40.19² =

Answer key

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

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