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Squares Trick Worksheet

Speed calculation lesson 10: Squares next to a ten · Set 908 · 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. 1.61² =
  2. 2.79² =
  3. 3.21² =
  4. 4.69² =
  5. 5.61² =
  6. 6.41² =
  7. 7.61² =
  8. 8.81² =
  9. 9.71² =
  10. 10.71² =
  11. 11.61² =
  12. 12.31² =
  13. 13.41² =
  14. 14.71² =
  15. 15.81² =
  16. 16.79² =
  17. 17.51² =
  18. 18.79² =
  19. 19.31² =
  20. 20.61² =
  21. 21.49² =
  22. 22.19² =
  23. 23.29² =
  24. 24.81² =
  25. 25.49² =
  26. 26.31² =
  27. 27.41² =
  28. 28.91² =
  29. 29.29² =
  30. 30.91² =
  31. 31.91² =
  32. 32.81² =
  33. 33.19² =
  34. 34.31² =
  35. 35.31² =
  36. 36.19² =
  37. 37.31² =
  38. 38.89² =
  39. 39.79² =
  40. 40.71² =

Answer key

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

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