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Squares Trick Worksheet

Speed calculation lesson 10: Squares next to a ten · Set 949 · 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. 2.21² =
  3. 3.91² =
  4. 4.69² =
  5. 5.79² =
  6. 6.51² =
  7. 7.39² =
  8. 8.21² =
  9. 9.61² =
  10. 10.71² =
  11. 11.89² =
  12. 12.19² =
  13. 13.19² =
  14. 14.21² =
  15. 15.29² =
  16. 16.19² =
  17. 17.59² =
  18. 18.19² =
  19. 19.59² =
  20. 20.39² =
  21. 21.19² =
  22. 22.31² =
  23. 23.71² =
  24. 24.21² =
  25. 25.19² =
  26. 26.89² =
  27. 27.39² =
  28. 28.19² =
  29. 29.61² =
  30. 30.91² =
  31. 31.71² =
  32. 32.21² =
  33. 33.29² =
  34. 34.69² =
  35. 35.29² =
  36. 36.29² =
  37. 37.59² =
  38. 38.29² =
  39. 39.39² =
  40. 40.81² =

Answer key

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

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