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Squares Trick Worksheet

Speed calculation lesson 10: Squares next to a ten · Set 439 · 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. 1.59² =
  2. 2.39² =
  3. 3.91² =
  4. 4.21² =
  5. 5.39² =
  6. 6.69² =
  7. 7.31² =
  8. 8.59² =
  9. 9.31² =
  10. 10.59² =
  11. 11.21² =
  12. 12.51² =
  13. 13.49² =
  14. 14.49² =
  15. 15.19² =
  16. 16.51² =
  17. 17.39² =
  18. 18.69² =
  19. 19.39² =
  20. 20.71² =
  21. 21.59² =
  22. 22.41² =
  23. 23.79² =
  24. 24.31² =
  25. 25.81² =
  26. 26.49² =
  27. 27.31² =
  28. 28.89² =
  29. 29.91² =
  30. 30.31² =
  31. 31.71² =
  32. 32.81² =
  33. 33.31² =
  34. 34.61² =
  35. 35.29² =
  36. 36.29² =
  37. 37.71² =
  38. 38.71² =
  39. 39.69² =
  40. 40.51² =

Answer key

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

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