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Squares Trick Worksheet

Speed calculation lesson 10: Squares next to a ten · Set 952 · 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. 1.69² =
  2. 2.41² =
  3. 3.91² =
  4. 4.59² =
  5. 5.49² =
  6. 6.69² =
  7. 7.19² =
  8. 8.51² =
  9. 9.19² =
  10. 10.29² =
  11. 11.69² =
  12. 12.29² =
  13. 13.41² =
  14. 14.19² =
  15. 15.71² =
  16. 16.39² =
  17. 17.31² =
  18. 18.61² =
  19. 19.41² =
  20. 20.29² =
  21. 21.49² =
  22. 22.59² =
  23. 23.81² =
  24. 24.69² =
  25. 25.81² =
  26. 26.49² =
  27. 27.29² =
  28. 28.29² =
  29. 29.61² =
  30. 30.81² =
  31. 31.69² =
  32. 32.79² =
  33. 33.89² =
  34. 34.71² =
  35. 35.29² =
  36. 36.91² =
  37. 37.91² =
  38. 38.29² =
  39. 39.29² =
  40. 40.61² =

Answer key

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

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