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Squares Trick Worksheet

Speed calculation lesson 10: Squares next to a ten · Set 894 · 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. 1.21² =
  2. 2.51² =
  3. 3.61² =
  4. 4.39² =
  5. 5.91² =
  6. 6.79² =
  7. 7.71² =
  8. 8.81² =
  9. 9.81² =
  10. 10.79² =
  11. 11.61² =
  12. 12.39² =
  13. 13.29² =
  14. 14.29² =
  15. 15.69² =
  16. 16.89² =
  17. 17.79² =
  18. 18.29² =
  19. 19.31² =
  20. 20.51² =
  21. 21.19² =
  22. 22.71² =
  23. 23.41² =
  24. 24.79² =
  25. 25.29² =
  26. 26.39² =
  27. 27.71² =
  28. 28.19² =
  29. 29.19² =
  30. 30.71² =
  31. 31.61² =
  32. 32.39² =
  33. 33.61² =
  34. 34.89² =
  35. 35.29² =
  36. 36.41² =
  37. 37.21² =
  38. 38.61² =
  39. 39.21² =
  40. 40.31² =

Answer key

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

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