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Squares Trick Worksheet

Speed calculation lesson 10: Squares next to a ten · Set 946 · 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. 1.91² =
  2. 2.91² =
  3. 3.61² =
  4. 4.61² =
  5. 5.29² =
  6. 6.59² =
  7. 7.61² =
  8. 8.31² =
  9. 9.79² =
  10. 10.61² =
  11. 11.31² =
  12. 12.79² =
  13. 13.89² =
  14. 14.39² =
  15. 15.79² =
  16. 16.91² =
  17. 17.51² =
  18. 18.19² =
  19. 19.21² =
  20. 20.69² =
  21. 21.71² =
  22. 22.19² =
  23. 23.21² =
  24. 24.59² =
  25. 25.19² =
  26. 26.39² =
  27. 27.29² =
  28. 28.39² =
  29. 29.49² =
  30. 30.29² =
  31. 31.19² =
  32. 32.21² =
  33. 33.21² =
  34. 34.41² =
  35. 35.59² =
  36. 36.39² =
  37. 37.49² =
  38. 38.19² =
  39. 39.91² =
  40. 40.39² =

Answer key

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

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