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Squares Trick Worksheet

Speed calculation lesson 10: Squares next to a ten · Set 920 · 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. 1.71² =
  2. 2.79² =
  3. 3.61² =
  4. 4.29² =
  5. 5.79² =
  6. 6.89² =
  7. 7.71² =
  8. 8.21² =
  9. 9.69² =
  10. 10.79² =
  11. 11.41² =
  12. 12.89² =
  13. 13.71² =
  14. 14.71² =
  15. 15.61² =
  16. 16.29² =
  17. 17.89² =
  18. 18.39² =
  19. 19.59² =
  20. 20.41² =
  21. 21.71² =
  22. 22.19² =
  23. 23.79² =
  24. 24.41² =
  25. 25.51² =
  26. 26.89² =
  27. 27.59² =
  28. 28.21² =
  29. 29.21² =
  30. 30.89² =
  31. 31.79² =
  32. 32.51² =
  33. 33.69² =
  34. 34.19² =
  35. 35.81² =
  36. 36.51² =
  37. 37.29² =
  38. 38.91² =
  39. 39.41² =
  40. 40.51² =

Answer key

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

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