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Squares Trick Worksheet

Speed calculation lesson 10: Squares next to a ten · Set 977 · 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. 1.79² =
  2. 2.41² =
  3. 3.81² =
  4. 4.39² =
  5. 5.29² =
  6. 6.19² =
  7. 7.41² =
  8. 8.41² =
  9. 9.21² =
  10. 10.29² =
  11. 11.41² =
  12. 12.21² =
  13. 13.41² =
  14. 14.49² =
  15. 15.39² =
  16. 16.19² =
  17. 17.71² =
  18. 18.39² =
  19. 19.21² =
  20. 20.71² =
  21. 21.71² =
  22. 22.19² =
  23. 23.79² =
  24. 24.91² =
  25. 25.39² =
  26. 26.89² =
  27. 27.89² =
  28. 28.61² =
  29. 29.79² =
  30. 30.71² =
  31. 31.29² =
  32. 32.39² =
  33. 33.91² =
  34. 34.81² =
  35. 35.69² =
  36. 36.29² =
  37. 37.79² =
  38. 38.39² =
  39. 39.51² =
  40. 40.81² =

Answer key

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

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