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Squares Trick Worksheet

Speed calculation lesson 10: Squares next to a ten · Set 940 · 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. 1.71² =
  2. 2.39² =
  3. 3.19² =
  4. 4.29² =
  5. 5.91² =
  6. 6.89² =
  7. 7.39² =
  8. 8.59² =
  9. 9.69² =
  10. 10.41² =
  11. 11.49² =
  12. 12.61² =
  13. 13.59² =
  14. 14.41² =
  15. 15.19² =
  16. 16.79² =
  17. 17.89² =
  18. 18.71² =
  19. 19.91² =
  20. 20.79² =
  21. 21.31² =
  22. 22.61² =
  23. 23.39² =
  24. 24.71² =
  25. 25.31² =
  26. 26.89² =
  27. 27.69² =
  28. 28.21² =
  29. 29.41² =
  30. 30.69² =
  31. 31.59² =
  32. 32.61² =
  33. 33.19² =
  34. 34.69² =
  35. 35.39² =
  36. 36.21² =
  37. 37.21² =
  38. 38.31² =
  39. 39.19² =
  40. 40.79² =

Answer key

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

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