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Squares Trick Worksheet

Speed calculation lesson 10: Squares next to a ten · Set 893 · 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. 1.31² =
  2. 2.49² =
  3. 3.49² =
  4. 4.89² =
  5. 5.69² =
  6. 6.91² =
  7. 7.39² =
  8. 8.31² =
  9. 9.29² =
  10. 10.49² =
  11. 11.81² =
  12. 12.49² =
  13. 13.61² =
  14. 14.49² =
  15. 15.61² =
  16. 16.89² =
  17. 17.29² =
  18. 18.71² =
  19. 19.21² =
  20. 20.89² =
  21. 21.49² =
  22. 22.39² =
  23. 23.61² =
  24. 24.29² =
  25. 25.29² =
  26. 26.19² =
  27. 27.29² =
  28. 28.21² =
  29. 29.29² =
  30. 30.19² =
  31. 31.89² =
  32. 32.21² =
  33. 33.61² =
  34. 34.49² =
  35. 35.51² =
  36. 36.91² =
  37. 37.61² =
  38. 38.29² =
  39. 39.89² =
  40. 40.79² =

Answer key

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

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