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Squares Trick Worksheet

Speed calculation lesson 10: Squares next to a ten · Set 932 · 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. 1.69² =
  2. 2.59² =
  3. 3.19² =
  4. 4.21² =
  5. 5.81² =
  6. 6.59² =
  7. 7.61² =
  8. 8.79² =
  9. 9.81² =
  10. 10.21² =
  11. 11.29² =
  12. 12.71² =
  13. 13.21² =
  14. 14.71² =
  15. 15.31² =
  16. 16.59² =
  17. 17.21² =
  18. 18.91² =
  19. 19.79² =
  20. 20.39² =
  21. 21.79² =
  22. 22.19² =
  23. 23.61² =
  24. 24.21² =
  25. 25.41² =
  26. 26.41² =
  27. 27.19² =
  28. 28.71² =
  29. 29.29² =
  30. 30.19² =
  31. 31.51² =
  32. 32.21² =
  33. 33.79² =
  34. 34.21² =
  35. 35.39² =
  36. 36.39² =
  37. 37.19² =
  38. 38.81² =
  39. 39.61² =
  40. 40.29² =

Answer key

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

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