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Squares Trick Worksheet

Speed calculation lesson 10: Squares next to a ten · Set 901 · 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. 2.51² =
  3. 3.19² =
  4. 4.79² =
  5. 5.29² =
  6. 6.19² =
  7. 7.31² =
  8. 8.71² =
  9. 9.81² =
  10. 10.31² =
  11. 11.39² =
  12. 12.39² =
  13. 13.51² =
  14. 14.21² =
  15. 15.29² =
  16. 16.41² =
  17. 17.89² =
  18. 18.21² =
  19. 19.59² =
  20. 20.61² =
  21. 21.81² =
  22. 22.61² =
  23. 23.81² =
  24. 24.41² =
  25. 25.51² =
  26. 26.81² =
  27. 27.41² =
  28. 28.59² =
  29. 29.91² =
  30. 30.59² =
  31. 31.81² =
  32. 32.69² =
  33. 33.21² =
  34. 34.69² =
  35. 35.69² =
  36. 36.21² =
  37. 37.49² =
  38. 38.61² =
  39. 39.69² =
  40. 40.19² =

Answer key

  1. 3721
  2. 2601
  3. 361
  4. 6241
  5. 841
  6. 361
  7. 961
  8. 5041
  9. 6561
  10. 961
  11. 1521
  12. 1521
  13. 2601
  14. 441
  15. 841
  16. 1681
  17. 7921
  18. 441
  19. 3481
  20. 3721
  21. 6561
  22. 3721
  23. 6561
  24. 1681
  25. 2601
  26. 6561
  27. 1681
  28. 3481
  29. 8281
  30. 3481
  31. 6561
  32. 4761
  33. 441
  34. 4761
  35. 4761
  36. 441
  37. 2401
  38. 3721
  39. 4761
  40. 361

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