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Squares Trick Worksheet

Speed calculation lesson 10: Squares next to a ten · Set 931 · 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. 1.49² =
  2. 2.89² =
  3. 3.69² =
  4. 4.71² =
  5. 5.91² =
  6. 6.71² =
  7. 7.31² =
  8. 8.41² =
  9. 9.79² =
  10. 10.19² =
  11. 11.19² =
  12. 12.21² =
  13. 13.31² =
  14. 14.61² =
  15. 15.59² =
  16. 16.29² =
  17. 17.49² =
  18. 18.49² =
  19. 19.59² =
  20. 20.21² =
  21. 21.51² =
  22. 22.29² =
  23. 23.51² =
  24. 24.69² =
  25. 25.71² =
  26. 26.89² =
  27. 27.19² =
  28. 28.69² =
  29. 29.19² =
  30. 30.79² =
  31. 31.71² =
  32. 32.21² =
  33. 33.71² =
  34. 34.71² =
  35. 35.21² =
  36. 36.79² =
  37. 37.19² =
  38. 38.39² =
  39. 39.91² =
  40. 40.39² =

Answer key

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

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