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Squares Trick Worksheet

Speed calculation lesson 10: Squares next to a ten · Set 967 · 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. 2.59² =
  3. 3.69² =
  4. 4.49² =
  5. 5.71² =
  6. 6.39² =
  7. 7.59² =
  8. 8.61² =
  9. 9.69² =
  10. 10.21² =
  11. 11.51² =
  12. 12.29² =
  13. 13.89² =
  14. 14.19² =
  15. 15.39² =
  16. 16.21² =
  17. 17.59² =
  18. 18.59² =
  19. 19.69² =
  20. 20.51² =
  21. 21.51² =
  22. 22.69² =
  23. 23.61² =
  24. 24.31² =
  25. 25.51² =
  26. 26.59² =
  27. 27.21² =
  28. 28.39² =
  29. 29.39² =
  30. 30.71² =
  31. 31.41² =
  32. 32.31² =
  33. 33.39² =
  34. 34.69² =
  35. 35.19² =
  36. 36.71² =
  37. 37.71² =
  38. 38.79² =
  39. 39.41² =
  40. 40.79² =

Answer key

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

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