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Squares Trick Worksheet

Speed calculation lesson 10: Squares next to a ten · Set 907 · 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. 2.19² =
  3. 3.41² =
  4. 4.79² =
  5. 5.79² =
  6. 6.49² =
  7. 7.49² =
  8. 8.51² =
  9. 9.49² =
  10. 10.61² =
  11. 11.89² =
  12. 12.31² =
  13. 13.81² =
  14. 14.31² =
  15. 15.81² =
  16. 16.39² =
  17. 17.39² =
  18. 18.49² =
  19. 19.89² =
  20. 20.59² =
  21. 21.49² =
  22. 22.89² =
  23. 23.19² =
  24. 24.51² =
  25. 25.79² =
  26. 26.69² =
  27. 27.91² =
  28. 28.69² =
  29. 29.59² =
  30. 30.91² =
  31. 31.91² =
  32. 32.19² =
  33. 33.21² =
  34. 34.29² =
  35. 35.51² =
  36. 36.41² =
  37. 37.19² =
  38. 38.31² =
  39. 39.19² =
  40. 40.39² =

Answer key

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

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