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Squares Trick Worksheet

Speed calculation lesson 10: Squares next to a ten · Set 937 · 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. 1.49² =
  2. 2.21² =
  3. 3.29² =
  4. 4.29² =
  5. 5.71² =
  6. 6.89² =
  7. 7.89² =
  8. 8.91² =
  9. 9.29² =
  10. 10.39² =
  11. 11.31² =
  12. 12.21² =
  13. 13.81² =
  14. 14.69² =
  15. 15.61² =
  16. 16.29² =
  17. 17.71² =
  18. 18.49² =
  19. 19.41² =
  20. 20.41² =
  21. 21.61² =
  22. 22.41² =
  23. 23.21² =
  24. 24.49² =
  25. 25.51² =
  26. 26.21² =
  27. 27.21² =
  28. 28.79² =
  29. 29.41² =
  30. 30.81² =
  31. 31.39² =
  32. 32.91² =
  33. 33.31² =
  34. 34.31² =
  35. 35.89² =
  36. 36.89² =
  37. 37.19² =
  38. 38.79² =
  39. 39.91² =
  40. 40.91² =

Answer key

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

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