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Squares Trick Worksheet

Speed calculation lesson 10: Squares next to a ten · Set 994 · 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. 2.29² =
  3. 3.39² =
  4. 4.71² =
  5. 5.19² =
  6. 6.51² =
  7. 7.49² =
  8. 8.19² =
  9. 9.71² =
  10. 10.79² =
  11. 11.79² =
  12. 12.29² =
  13. 13.19² =
  14. 14.51² =
  15. 15.49² =
  16. 16.49² =
  17. 17.31² =
  18. 18.79² =
  19. 19.31² =
  20. 20.29² =
  21. 21.49² =
  22. 22.79² =
  23. 23.81² =
  24. 24.19² =
  25. 25.69² =
  26. 26.39² =
  27. 27.69² =
  28. 28.79² =
  29. 29.49² =
  30. 30.69² =
  31. 31.19² =
  32. 32.79² =
  33. 33.31² =
  34. 34.61² =
  35. 35.59² =
  36. 36.59² =
  37. 37.29² =
  38. 38.71² =
  39. 39.71² =
  40. 40.21² =

Answer key

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

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