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Squares Trick Worksheet

Speed calculation lesson 10: Squares next to a ten · Set 964 · 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. 1.39² =
  2. 2.69² =
  3. 3.29² =
  4. 4.21² =
  5. 5.49² =
  6. 6.79² =
  7. 7.29² =
  8. 8.19² =
  9. 9.21² =
  10. 10.39² =
  11. 11.69² =
  12. 12.41² =
  13. 13.49² =
  14. 14.41² =
  15. 15.71² =
  16. 16.39² =
  17. 17.29² =
  18. 18.51² =
  19. 19.39² =
  20. 20.19² =
  21. 21.89² =
  22. 22.89² =
  23. 23.19² =
  24. 24.89² =
  25. 25.59² =
  26. 26.49² =
  27. 27.81² =
  28. 28.29² =
  29. 29.59² =
  30. 30.81² =
  31. 31.39² =
  32. 32.21² =
  33. 33.71² =
  34. 34.61² =
  35. 35.59² =
  36. 36.71² =
  37. 37.39² =
  38. 38.71² =
  39. 39.89² =
  40. 40.29² =

Answer key

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

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