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Squares Trick Worksheet

Speed calculation lesson 10: Squares next to a ten · Set 889 · 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. 2.59² =
  3. 3.61² =
  4. 4.19² =
  5. 5.29² =
  6. 6.19² =
  7. 7.29² =
  8. 8.39² =
  9. 9.31² =
  10. 10.39² =
  11. 11.29² =
  12. 12.59² =
  13. 13.81² =
  14. 14.21² =
  15. 15.79² =
  16. 16.79² =
  17. 17.91² =
  18. 18.39² =
  19. 19.59² =
  20. 20.51² =
  21. 21.29² =
  22. 22.19² =
  23. 23.19² =
  24. 24.61² =
  25. 25.19² =
  26. 26.71² =
  27. 27.61² =
  28. 28.21² =
  29. 29.29² =
  30. 30.71² =
  31. 31.49² =
  32. 32.19² =
  33. 33.91² =
  34. 34.19² =
  35. 35.89² =
  36. 36.79² =
  37. 37.31² =
  38. 38.19² =
  39. 39.89² =
  40. 40.21² =

Answer key

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

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