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Squares Trick Worksheet

Speed calculation lesson 10: Squares next to a ten · Set 881 · 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. 1.21² =
  2. 2.61² =
  3. 3.41² =
  4. 4.29² =
  5. 5.39² =
  6. 6.89² =
  7. 7.79² =
  8. 8.59² =
  9. 9.39² =
  10. 10.49² =
  11. 11.51² =
  12. 12.81² =
  13. 13.21² =
  14. 14.69² =
  15. 15.31² =
  16. 16.39² =
  17. 17.79² =
  18. 18.49² =
  19. 19.21² =
  20. 20.29² =
  21. 21.29² =
  22. 22.79² =
  23. 23.91² =
  24. 24.91² =
  25. 25.49² =
  26. 26.59² =
  27. 27.69² =
  28. 28.79² =
  29. 29.59² =
  30. 30.21² =
  31. 31.49² =
  32. 32.39² =
  33. 33.91² =
  34. 34.69² =
  35. 35.31² =
  36. 36.19² =
  37. 37.69² =
  38. 38.89² =
  39. 39.91² =
  40. 40.59² =

Answer key

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

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