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Squares Trick Worksheet

Speed calculation lesson 10: Squares next to a ten · Set 950 · 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. 1.51² =
  2. 2.21² =
  3. 3.69² =
  4. 4.59² =
  5. 5.79² =
  6. 6.39² =
  7. 7.71² =
  8. 8.89² =
  9. 9.21² =
  10. 10.61² =
  11. 11.71² =
  12. 12.79² =
  13. 13.91² =
  14. 14.39² =
  15. 15.29² =
  16. 16.71² =
  17. 17.31² =
  18. 18.61² =
  19. 19.69² =
  20. 20.21² =
  21. 21.31² =
  22. 22.39² =
  23. 23.41² =
  24. 24.59² =
  25. 25.49² =
  26. 26.19² =
  27. 27.61² =
  28. 28.31² =
  29. 29.81² =
  30. 30.39² =
  31. 31.19² =
  32. 32.19² =
  33. 33.41² =
  34. 34.19² =
  35. 35.79² =
  36. 36.71² =
  37. 37.51² =
  38. 38.69² =
  39. 39.29² =
  40. 40.41² =

Answer key

  1. 2601
  2. 441
  3. 4761
  4. 3481
  5. 6241
  6. 1521
  7. 5041
  8. 7921
  9. 441
  10. 3721
  11. 5041
  12. 6241
  13. 8281
  14. 1521
  15. 841
  16. 5041
  17. 961
  18. 3721
  19. 4761
  20. 441
  21. 961
  22. 1521
  23. 1681
  24. 3481
  25. 2401
  26. 361
  27. 3721
  28. 961
  29. 6561
  30. 1521
  31. 361
  32. 361
  33. 1681
  34. 361
  35. 6241
  36. 5041
  37. 2601
  38. 4761
  39. 841
  40. 1681

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