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Squares Trick Worksheet

Speed calculation lesson 10: Squares next to a ten · Set 883 · 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. 2.21² =
  3. 3.79² =
  4. 4.29² =
  5. 5.19² =
  6. 6.79² =
  7. 7.21² =
  8. 8.81² =
  9. 9.69² =
  10. 10.89² =
  11. 11.91² =
  12. 12.31² =
  13. 13.49² =
  14. 14.31² =
  15. 15.79² =
  16. 16.81² =
  17. 17.29² =
  18. 18.51² =
  19. 19.71² =
  20. 20.41² =
  21. 21.59² =
  22. 22.91² =
  23. 23.19² =
  24. 24.91² =
  25. 25.19² =
  26. 26.39² =
  27. 27.49² =
  28. 28.39² =
  29. 29.89² =
  30. 30.81² =
  31. 31.41² =
  32. 32.49² =
  33. 33.89² =
  34. 34.21² =
  35. 35.29² =
  36. 36.29² =
  37. 37.91² =
  38. 38.29² =
  39. 39.21² =
  40. 40.91² =

Answer key

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

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