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Squares Trick Worksheet

Speed calculation lesson 10: Squares next to a ten · Set 838 · 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. 1.89² =
  2. 2.39² =
  3. 3.79² =
  4. 4.21² =
  5. 5.81² =
  6. 6.29² =
  7. 7.21² =
  8. 8.81² =
  9. 9.31² =
  10. 10.41² =
  11. 11.59² =
  12. 12.71² =
  13. 13.59² =
  14. 14.41² =
  15. 15.29² =
  16. 16.69² =
  17. 17.91² =
  18. 18.89² =
  19. 19.71² =
  20. 20.69² =
  21. 21.51² =
  22. 22.51² =
  23. 23.39² =
  24. 24.61² =
  25. 25.51² =
  26. 26.61² =
  27. 27.19² =
  28. 28.31² =
  29. 29.91² =
  30. 30.91² =
  31. 31.59² =
  32. 32.41² =
  33. 33.21² =
  34. 34.61² =
  35. 35.59² =
  36. 36.81² =
  37. 37.69² =
  38. 38.81² =
  39. 39.81² =
  40. 40.19² =

Answer key

  1. 7921
  2. 1521
  3. 6241
  4. 441
  5. 6561
  6. 841
  7. 441
  8. 6561
  9. 961
  10. 1681
  11. 3481
  12. 5041
  13. 3481
  14. 1681
  15. 841
  16. 4761
  17. 8281
  18. 7921
  19. 5041
  20. 4761
  21. 2601
  22. 2601
  23. 1521
  24. 3721
  25. 2601
  26. 3721
  27. 361
  28. 961
  29. 8281
  30. 8281
  31. 3481
  32. 1681
  33. 441
  34. 3721
  35. 3481
  36. 6561
  37. 4761
  38. 6561
  39. 6561
  40. 361

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