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Squares Trick Worksheet

Speed calculation lesson 10: Squares next to a ten · Set 918 · 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. 1.51² =
  2. 2.49² =
  3. 3.81² =
  4. 4.29² =
  5. 5.51² =
  6. 6.89² =
  7. 7.71² =
  8. 8.51² =
  9. 9.29² =
  10. 10.49² =
  11. 11.51² =
  12. 12.19² =
  13. 13.31² =
  14. 14.71² =
  15. 15.19² =
  16. 16.69² =
  17. 17.69² =
  18. 18.91² =
  19. 19.31² =
  20. 20.49² =
  21. 21.89² =
  22. 22.71² =
  23. 23.39² =
  24. 24.49² =
  25. 25.81² =
  26. 26.49² =
  27. 27.19² =
  28. 28.19² =
  29. 29.59² =
  30. 30.59² =
  31. 31.51² =
  32. 32.49² =
  33. 33.21² =
  34. 34.79² =
  35. 35.81² =
  36. 36.21² =
  37. 37.19² =
  38. 38.49² =
  39. 39.89² =
  40. 40.49² =

Answer key

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

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