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Squares Trick Worksheet

Speed calculation lesson 10: Squares next to a ten · Set 926 · 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. 1.29² =
  2. 2.51² =
  3. 3.51² =
  4. 4.79² =
  5. 5.51² =
  6. 6.89² =
  7. 7.59² =
  8. 8.49² =
  9. 9.59² =
  10. 10.51² =
  11. 11.29² =
  12. 12.79² =
  13. 13.51² =
  14. 14.19² =
  15. 15.51² =
  16. 16.31² =
  17. 17.69² =
  18. 18.51² =
  19. 19.91² =
  20. 20.41² =
  21. 21.31² =
  22. 22.81² =
  23. 23.71² =
  24. 24.29² =
  25. 25.29² =
  26. 26.91² =
  27. 27.61² =
  28. 28.91² =
  29. 29.51² =
  30. 30.41² =
  31. 31.79² =
  32. 32.59² =
  33. 33.71² =
  34. 34.49² =
  35. 35.59² =
  36. 36.41² =
  37. 37.39² =
  38. 38.39² =
  39. 39.71² =
  40. 40.21² =

Answer key

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

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