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Squares Trick Worksheet

Speed calculation lesson 10: Squares next to a ten · Set 983 · 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. 2.49² =
  3. 3.31² =
  4. 4.31² =
  5. 5.29² =
  6. 6.69² =
  7. 7.29² =
  8. 8.29² =
  9. 9.71² =
  10. 10.59² =
  11. 11.29² =
  12. 12.59² =
  13. 13.29² =
  14. 14.91² =
  15. 15.59² =
  16. 16.89² =
  17. 17.29² =
  18. 18.91² =
  19. 19.79² =
  20. 20.39² =
  21. 21.69² =
  22. 22.59² =
  23. 23.79² =
  24. 24.39² =
  25. 25.29² =
  26. 26.51² =
  27. 27.19² =
  28. 28.61² =
  29. 29.31² =
  30. 30.61² =
  31. 31.41² =
  32. 32.79² =
  33. 33.89² =
  34. 34.69² =
  35. 35.41² =
  36. 36.51² =
  37. 37.39² =
  38. 38.89² =
  39. 39.51² =
  40. 40.19² =

Answer key

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

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