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Squares Trick Worksheet

Speed calculation lesson 10: Squares next to a ten · Set 880 · 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. 1.41² =
  2. 2.29² =
  3. 3.79² =
  4. 4.71² =
  5. 5.59² =
  6. 6.79² =
  7. 7.89² =
  8. 8.49² =
  9. 9.81² =
  10. 10.81² =
  11. 11.89² =
  12. 12.69² =
  13. 13.59² =
  14. 14.21² =
  15. 15.41² =
  16. 16.89² =
  17. 17.71² =
  18. 18.79² =
  19. 19.39² =
  20. 20.69² =
  21. 21.69² =
  22. 22.29² =
  23. 23.19² =
  24. 24.41² =
  25. 25.49² =
  26. 26.51² =
  27. 27.31² =
  28. 28.39² =
  29. 29.21² =
  30. 30.39² =
  31. 31.71² =
  32. 32.21² =
  33. 33.21² =
  34. 34.79² =
  35. 35.39² =
  36. 36.79² =
  37. 37.71² =
  38. 38.79² =
  39. 39.71² =
  40. 40.21² =

Answer key

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

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