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Squares Trick Worksheet

Speed calculation lesson 10: Squares next to a ten · Set 955 · 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. 1.61² =
  2. 2.49² =
  3. 3.71² =
  4. 4.39² =
  5. 5.79² =
  6. 6.39² =
  7. 7.51² =
  8. 8.19² =
  9. 9.91² =
  10. 10.51² =
  11. 11.91² =
  12. 12.19² =
  13. 13.89² =
  14. 14.69² =
  15. 15.71² =
  16. 16.79² =
  17. 17.49² =
  18. 18.29² =
  19. 19.79² =
  20. 20.41² =
  21. 21.19² =
  22. 22.79² =
  23. 23.71² =
  24. 24.69² =
  25. 25.49² =
  26. 26.29² =
  27. 27.29² =
  28. 28.81² =
  29. 29.41² =
  30. 30.69² =
  31. 31.59² =
  32. 32.69² =
  33. 33.91² =
  34. 34.41² =
  35. 35.29² =
  36. 36.21² =
  37. 37.29² =
  38. 38.49² =
  39. 39.89² =
  40. 40.29² =

Answer key

  1. 3721
  2. 2401
  3. 5041
  4. 1521
  5. 6241
  6. 1521
  7. 2601
  8. 361
  9. 8281
  10. 2601
  11. 8281
  12. 361
  13. 7921
  14. 4761
  15. 5041
  16. 6241
  17. 2401
  18. 841
  19. 6241
  20. 1681
  21. 361
  22. 6241
  23. 5041
  24. 4761
  25. 2401
  26. 841
  27. 841
  28. 6561
  29. 1681
  30. 4761
  31. 3481
  32. 4761
  33. 8281
  34. 1681
  35. 841
  36. 441
  37. 841
  38. 2401
  39. 7921
  40. 841

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