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Squares Trick Worksheet

Speed calculation lesson 10: Squares next to a ten · Set 962 · 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. 1.79² =
  2. 2.39² =
  3. 3.19² =
  4. 4.89² =
  5. 5.49² =
  6. 6.21² =
  7. 7.49² =
  8. 8.81² =
  9. 9.71² =
  10. 10.79² =
  11. 11.71² =
  12. 12.61² =
  13. 13.59² =
  14. 14.31² =
  15. 15.19² =
  16. 16.41² =
  17. 17.29² =
  18. 18.49² =
  19. 19.19² =
  20. 20.91² =
  21. 21.79² =
  22. 22.89² =
  23. 23.69² =
  24. 24.21² =
  25. 25.19² =
  26. 26.79² =
  27. 27.39² =
  28. 28.51² =
  29. 29.19² =
  30. 30.71² =
  31. 31.51² =
  32. 32.59² =
  33. 33.39² =
  34. 34.71² =
  35. 35.81² =
  36. 36.89² =
  37. 37.81² =
  38. 38.31² =
  39. 39.39² =
  40. 40.79² =

Answer key

  1. 6241
  2. 1521
  3. 361
  4. 7921
  5. 2401
  6. 441
  7. 2401
  8. 6561
  9. 5041
  10. 6241
  11. 5041
  12. 3721
  13. 3481
  14. 961
  15. 361
  16. 1681
  17. 841
  18. 2401
  19. 361
  20. 8281
  21. 6241
  22. 7921
  23. 4761
  24. 441
  25. 361
  26. 6241
  27. 1521
  28. 2601
  29. 361
  30. 5041
  31. 2601
  32. 3481
  33. 1521
  34. 5041
  35. 6561
  36. 7921
  37. 6561
  38. 961
  39. 1521
  40. 6241

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