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Squares Trick Worksheet

Speed calculation lesson 10: Squares next to a ten · Set 935 · 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. 1.49² =
  2. 2.19² =
  3. 3.41² =
  4. 4.79² =
  5. 5.49² =
  6. 6.49² =
  7. 7.91² =
  8. 8.81² =
  9. 9.79² =
  10. 10.29² =
  11. 11.81² =
  12. 12.19² =
  13. 13.51² =
  14. 14.91² =
  15. 15.49² =
  16. 16.71² =
  17. 17.61² =
  18. 18.39² =
  19. 19.29² =
  20. 20.21² =
  21. 21.89² =
  22. 22.61² =
  23. 23.79² =
  24. 24.69² =
  25. 25.49² =
  26. 26.49² =
  27. 27.89² =
  28. 28.41² =
  29. 29.39² =
  30. 30.31² =
  31. 31.21² =
  32. 32.21² =
  33. 33.81² =
  34. 34.21² =
  35. 35.79² =
  36. 36.39² =
  37. 37.69² =
  38. 38.31² =
  39. 39.71² =
  40. 40.49² =

Answer key

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

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