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Squares Trick Worksheet

Speed calculation lesson 10: Squares next to a ten · Set 882 · 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. 1.79² =
  2. 2.91² =
  3. 3.29² =
  4. 4.29² =
  5. 5.39² =
  6. 6.31² =
  7. 7.61² =
  8. 8.79² =
  9. 9.91² =
  10. 10.71² =
  11. 11.91² =
  12. 12.61² =
  13. 13.79² =
  14. 14.21² =
  15. 15.81² =
  16. 16.21² =
  17. 17.59² =
  18. 18.81² =
  19. 19.21² =
  20. 20.89² =
  21. 21.79² =
  22. 22.39² =
  23. 23.49² =
  24. 24.79² =
  25. 25.19² =
  26. 26.81² =
  27. 27.31² =
  28. 28.41² =
  29. 29.91² =
  30. 30.19² =
  31. 31.61² =
  32. 32.39² =
  33. 33.19² =
  34. 34.19² =
  35. 35.29² =
  36. 36.49² =
  37. 37.91² =
  38. 38.39² =
  39. 39.41² =
  40. 40.19² =

Answer key

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

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