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Squares Trick Worksheet

Speed calculation lesson 10: Squares next to a ten · Set 982 · 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. 2.59² =
  3. 3.71² =
  4. 4.29² =
  5. 5.19² =
  6. 6.29² =
  7. 7.51² =
  8. 8.41² =
  9. 9.39² =
  10. 10.49² =
  11. 11.21² =
  12. 12.39² =
  13. 13.39² =
  14. 14.69² =
  15. 15.59² =
  16. 16.79² =
  17. 17.51² =
  18. 18.21² =
  19. 19.59² =
  20. 20.21² =
  21. 21.19² =
  22. 22.71² =
  23. 23.81² =
  24. 24.79² =
  25. 25.89² =
  26. 26.39² =
  27. 27.79² =
  28. 28.81² =
  29. 29.71² =
  30. 30.71² =
  31. 31.21² =
  32. 32.69² =
  33. 33.31² =
  34. 34.41² =
  35. 35.89² =
  36. 36.79² =
  37. 37.21² =
  38. 38.81² =
  39. 39.79² =
  40. 40.71² =

Answer key

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

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