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Squares Trick Worksheet

Speed calculation lesson 10: Squares next to a ten · Set 945 · 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. 1.79² =
  2. 2.29² =
  3. 3.61² =
  4. 4.79² =
  5. 5.91² =
  6. 6.41² =
  7. 7.19² =
  8. 8.79² =
  9. 9.29² =
  10. 10.61² =
  11. 11.91² =
  12. 12.21² =
  13. 13.79² =
  14. 14.69² =
  15. 15.49² =
  16. 16.79² =
  17. 17.89² =
  18. 18.71² =
  19. 19.41² =
  20. 20.49² =
  21. 21.49² =
  22. 22.89² =
  23. 23.91² =
  24. 24.21² =
  25. 25.39² =
  26. 26.39² =
  27. 27.69² =
  28. 28.61² =
  29. 29.79² =
  30. 30.91² =
  31. 31.69² =
  32. 32.49² =
  33. 33.49² =
  34. 34.71² =
  35. 35.21² =
  36. 36.91² =
  37. 37.69² =
  38. 38.91² =
  39. 39.19² =
  40. 40.71² =

Answer key

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

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