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Squares Trick Worksheet

Speed calculation lesson 10: Squares next to a ten · Set 996 · 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. 1.29² =
  2. 2.89² =
  3. 3.89² =
  4. 4.19² =
  5. 5.39² =
  6. 6.91² =
  7. 7.29² =
  8. 8.59² =
  9. 9.19² =
  10. 10.89² =
  11. 11.71² =
  12. 12.29² =
  13. 13.49² =
  14. 14.39² =
  15. 15.39² =
  16. 16.81² =
  17. 17.61² =
  18. 18.91² =
  19. 19.91² =
  20. 20.31² =
  21. 21.79² =
  22. 22.21² =
  23. 23.81² =
  24. 24.41² =
  25. 25.21² =
  26. 26.69² =
  27. 27.21² =
  28. 28.39² =
  29. 29.49² =
  30. 30.81² =
  31. 31.71² =
  32. 32.41² =
  33. 33.69² =
  34. 34.61² =
  35. 35.49² =
  36. 36.49² =
  37. 37.71² =
  38. 38.31² =
  39. 39.31² =
  40. 40.21² =

Answer key

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

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