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Squares Trick Worksheet

Speed calculation lesson 10: Squares next to a ten · Set 839 · 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. 1.49² =
  2. 2.69² =
  3. 3.59² =
  4. 4.21² =
  5. 5.49² =
  6. 6.29² =
  7. 7.29² =
  8. 8.59² =
  9. 9.79² =
  10. 10.29² =
  11. 11.61² =
  12. 12.39² =
  13. 13.61² =
  14. 14.29² =
  15. 15.61² =
  16. 16.41² =
  17. 17.61² =
  18. 18.69² =
  19. 19.71² =
  20. 20.51² =
  21. 21.79² =
  22. 22.29² =
  23. 23.31² =
  24. 24.41² =
  25. 25.89² =
  26. 26.71² =
  27. 27.19² =
  28. 28.29² =
  29. 29.51² =
  30. 30.89² =
  31. 31.31² =
  32. 32.29² =
  33. 33.29² =
  34. 34.21² =
  35. 35.91² =
  36. 36.49² =
  37. 37.39² =
  38. 38.29² =
  39. 39.89² =
  40. 40.39² =

Answer key

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

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