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Squares Trick Worksheet

Speed calculation lesson 10: Squares next to a ten · Set 987 · 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. 1.19² =
  2. 2.79² =
  3. 3.79² =
  4. 4.19² =
  5. 5.79² =
  6. 6.89² =
  7. 7.71² =
  8. 8.39² =
  9. 9.59² =
  10. 10.39² =
  11. 11.29² =
  12. 12.49² =
  13. 13.89² =
  14. 14.29² =
  15. 15.41² =
  16. 16.49² =
  17. 17.21² =
  18. 18.51² =
  19. 19.91² =
  20. 20.21² =
  21. 21.31² =
  22. 22.29² =
  23. 23.59² =
  24. 24.71² =
  25. 25.69² =
  26. 26.51² =
  27. 27.79² =
  28. 28.39² =
  29. 29.79² =
  30. 30.51² =
  31. 31.79² =
  32. 32.69² =
  33. 33.91² =
  34. 34.21² =
  35. 35.39² =
  36. 36.49² =
  37. 37.39² =
  38. 38.49² =
  39. 39.49² =
  40. 40.91² =

Answer key

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

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