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Squares Trick Worksheet

Speed calculation lesson 10: Squares next to a ten · Set 897 · 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. 2.21² =
  3. 3.29² =
  4. 4.91² =
  5. 5.71² =
  6. 6.39² =
  7. 7.29² =
  8. 8.79² =
  9. 9.79² =
  10. 10.79² =
  11. 11.31² =
  12. 12.19² =
  13. 13.39² =
  14. 14.59² =
  15. 15.31² =
  16. 16.19² =
  17. 17.91² =
  18. 18.19² =
  19. 19.21² =
  20. 20.31² =
  21. 21.49² =
  22. 22.21² =
  23. 23.79² =
  24. 24.69² =
  25. 25.71² =
  26. 26.51² =
  27. 27.59² =
  28. 28.69² =
  29. 29.79² =
  30. 30.39² =
  31. 31.61² =
  32. 32.21² =
  33. 33.89² =
  34. 34.59² =
  35. 35.39² =
  36. 36.61² =
  37. 37.41² =
  38. 38.59² =
  39. 39.59² =
  40. 40.19² =

Answer key

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

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