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Squares Trick Worksheet

Speed calculation lesson 10: Squares next to a ten · Set 992 · 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. 1.31² =
  2. 2.51² =
  3. 3.89² =
  4. 4.21² =
  5. 5.81² =
  6. 6.69² =
  7. 7.81² =
  8. 8.61² =
  9. 9.19² =
  10. 10.69² =
  11. 11.71² =
  12. 12.41² =
  13. 13.89² =
  14. 14.79² =
  15. 15.79² =
  16. 16.39² =
  17. 17.89² =
  18. 18.29² =
  19. 19.89² =
  20. 20.19² =
  21. 21.91² =
  22. 22.81² =
  23. 23.41² =
  24. 24.59² =
  25. 25.59² =
  26. 26.21² =
  27. 27.81² =
  28. 28.21² =
  29. 29.71² =
  30. 30.31² =
  31. 31.71² =
  32. 32.31² =
  33. 33.69² =
  34. 34.49² =
  35. 35.41² =
  36. 36.61² =
  37. 37.51² =
  38. 38.19² =
  39. 39.79² =
  40. 40.59² =

Answer key

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

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