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Squares Trick Worksheet

Speed calculation lesson 10: Squares next to a ten · Set 988 · 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. 2.19² =
  3. 3.21² =
  4. 4.39² =
  5. 5.41² =
  6. 6.81² =
  7. 7.49² =
  8. 8.41² =
  9. 9.19² =
  10. 10.31² =
  11. 11.39² =
  12. 12.41² =
  13. 13.81² =
  14. 14.21² =
  15. 15.29² =
  16. 16.79² =
  17. 17.29² =
  18. 18.19² =
  19. 19.89² =
  20. 20.49² =
  21. 21.31² =
  22. 22.21² =
  23. 23.49² =
  24. 24.61² =
  25. 25.71² =
  26. 26.61² =
  27. 27.69² =
  28. 28.21² =
  29. 29.21² =
  30. 30.81² =
  31. 31.79² =
  32. 32.59² =
  33. 33.39² =
  34. 34.31² =
  35. 35.89² =
  36. 36.61² =
  37. 37.71² =
  38. 38.59² =
  39. 39.59² =
  40. 40.61² =

Answer key

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

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