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Squares Trick Worksheet

Speed calculation lesson 10: Squares next to a ten · Set 951 · 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. 2.41² =
  3. 3.39² =
  4. 4.71² =
  5. 5.41² =
  6. 6.31² =
  7. 7.19² =
  8. 8.29² =
  9. 9.19² =
  10. 10.89² =
  11. 11.79² =
  12. 12.19² =
  13. 13.89² =
  14. 14.19² =
  15. 15.21² =
  16. 16.69² =
  17. 17.91² =
  18. 18.69² =
  19. 19.51² =
  20. 20.31² =
  21. 21.41² =
  22. 22.89² =
  23. 23.39² =
  24. 24.61² =
  25. 25.71² =
  26. 26.49² =
  27. 27.81² =
  28. 28.91² =
  29. 29.19² =
  30. 30.41² =
  31. 31.39² =
  32. 32.29² =
  33. 33.69² =
  34. 34.39² =
  35. 35.81² =
  36. 36.19² =
  37. 37.29² =
  38. 38.39² =
  39. 39.49² =
  40. 40.81² =

Answer key

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

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