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Squares Trick Worksheet

Speed calculation lesson 10: Squares next to a ten · Set 997 · 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. 1.41² =
  2. 2.79² =
  3. 3.61² =
  4. 4.71² =
  5. 5.31² =
  6. 6.21² =
  7. 7.21² =
  8. 8.91² =
  9. 9.89² =
  10. 10.39² =
  11. 11.31² =
  12. 12.69² =
  13. 13.79² =
  14. 14.51² =
  15. 15.59² =
  16. 16.19² =
  17. 17.81² =
  18. 18.19² =
  19. 19.29² =
  20. 20.51² =
  21. 21.19² =
  22. 22.39² =
  23. 23.49² =
  24. 24.49² =
  25. 25.29² =
  26. 26.71² =
  27. 27.49² =
  28. 28.91² =
  29. 29.31² =
  30. 30.39² =
  31. 31.71² =
  32. 32.29² =
  33. 33.21² =
  34. 34.19² =
  35. 35.51² =
  36. 36.49² =
  37. 37.41² =
  38. 38.61² =
  39. 39.41² =
  40. 40.29² =

Answer key

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

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