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Squares Trick Worksheet

Speed calculation lesson 10: Squares next to a ten · Set 877 · 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. 1.21² =
  2. 2.61² =
  3. 3.81² =
  4. 4.81² =
  5. 5.39² =
  6. 6.29² =
  7. 7.39² =
  8. 8.19² =
  9. 9.61² =
  10. 10.71² =
  11. 11.91² =
  12. 12.29² =
  13. 13.91² =
  14. 14.69² =
  15. 15.19² =
  16. 16.41² =
  17. 17.49² =
  18. 18.41² =
  19. 19.79² =
  20. 20.49² =
  21. 21.49² =
  22. 22.71² =
  23. 23.91² =
  24. 24.69² =
  25. 25.89² =
  26. 26.91² =
  27. 27.31² =
  28. 28.69² =
  29. 29.59² =
  30. 30.59² =
  31. 31.21² =
  32. 32.49² =
  33. 33.19² =
  34. 34.51² =
  35. 35.49² =
  36. 36.29² =
  37. 37.71² =
  38. 38.31² =
  39. 39.29² =
  40. 40.51² =

Answer key

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

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