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Squares Trick Worksheet

Speed calculation lesson 10: Squares next to a ten · Set 934 · 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. 1.51² =
  2. 2.89² =
  3. 3.39² =
  4. 4.29² =
  5. 5.61² =
  6. 6.49² =
  7. 7.19² =
  8. 8.59² =
  9. 9.81² =
  10. 10.69² =
  11. 11.61² =
  12. 12.61² =
  13. 13.49² =
  14. 14.49² =
  15. 15.89² =
  16. 16.71² =
  17. 17.51² =
  18. 18.21² =
  19. 19.29² =
  20. 20.29² =
  21. 21.21² =
  22. 22.81² =
  23. 23.19² =
  24. 24.49² =
  25. 25.79² =
  26. 26.49² =
  27. 27.49² =
  28. 28.29² =
  29. 29.71² =
  30. 30.41² =
  31. 31.31² =
  32. 32.29² =
  33. 33.39² =
  34. 34.19² =
  35. 35.39² =
  36. 36.79² =
  37. 37.29² =
  38. 38.89² =
  39. 39.61² =
  40. 40.69² =

Answer key

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

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