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Squares Trick Worksheet

Speed calculation lesson 10: Squares next to a ten · Set 961 · 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. 1.69² =
  2. 2.69² =
  3. 3.69² =
  4. 4.71² =
  5. 5.31² =
  6. 6.29² =
  7. 7.41² =
  8. 8.79² =
  9. 9.71² =
  10. 10.91² =
  11. 11.61² =
  12. 12.29² =
  13. 13.89² =
  14. 14.81² =
  15. 15.81² =
  16. 16.69² =
  17. 17.31² =
  18. 18.69² =
  19. 19.71² =
  20. 20.69² =
  21. 21.69² =
  22. 22.71² =
  23. 23.51² =
  24. 24.89² =
  25. 25.61² =
  26. 26.69² =
  27. 27.79² =
  28. 28.91² =
  29. 29.81² =
  30. 30.49² =
  31. 31.71² =
  32. 32.59² =
  33. 33.39² =
  34. 34.49² =
  35. 35.29² =
  36. 36.21² =
  37. 37.49² =
  38. 38.49² =
  39. 39.59² =
  40. 40.39² =

Answer key

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

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