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Squares Trick Worksheet

Speed calculation lesson 10: Squares next to a ten · Set 966 · 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. 2.31² =
  3. 3.19² =
  4. 4.69² =
  5. 5.31² =
  6. 6.31² =
  7. 7.89² =
  8. 8.49² =
  9. 9.19² =
  10. 10.69² =
  11. 11.21² =
  12. 12.61² =
  13. 13.39² =
  14. 14.71² =
  15. 15.59² =
  16. 16.51² =
  17. 17.89² =
  18. 18.41² =
  19. 19.91² =
  20. 20.19² =
  21. 21.29² =
  22. 22.79² =
  23. 23.89² =
  24. 24.19² =
  25. 25.41² =
  26. 26.79² =
  27. 27.69² =
  28. 28.59² =
  29. 29.39² =
  30. 30.61² =
  31. 31.39² =
  32. 32.59² =
  33. 33.69² =
  34. 34.59² =
  35. 35.19² =
  36. 36.59² =
  37. 37.69² =
  38. 38.59² =
  39. 39.81² =
  40. 40.79² =

Answer key

  1. 1681
  2. 961
  3. 361
  4. 4761
  5. 961
  6. 961
  7. 7921
  8. 2401
  9. 361
  10. 4761
  11. 441
  12. 3721
  13. 1521
  14. 5041
  15. 3481
  16. 2601
  17. 7921
  18. 1681
  19. 8281
  20. 361
  21. 841
  22. 6241
  23. 7921
  24. 361
  25. 1681
  26. 6241
  27. 4761
  28. 3481
  29. 1521
  30. 3721
  31. 1521
  32. 3481
  33. 4761
  34. 3481
  35. 361
  36. 3481
  37. 4761
  38. 3481
  39. 6561
  40. 6241

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