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Squares Trick Worksheet

Speed calculation lesson 10: Squares next to a ten · Set 410 · 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. 1.89² =
  2. 2.29² =
  3. 3.19² =
  4. 4.69² =
  5. 5.69² =
  6. 6.29² =
  7. 7.61² =
  8. 8.61² =
  9. 9.41² =
  10. 10.79² =
  11. 11.29² =
  12. 12.39² =
  13. 13.41² =
  14. 14.31² =
  15. 15.51² =
  16. 16.69² =
  17. 17.79² =
  18. 18.49² =
  19. 19.79² =
  20. 20.79² =
  21. 21.41² =
  22. 22.21² =
  23. 23.41² =
  24. 24.21² =
  25. 25.19² =
  26. 26.21² =
  27. 27.39² =
  28. 28.31² =
  29. 29.31² =
  30. 30.69² =
  31. 31.39² =
  32. 32.79² =
  33. 33.79² =
  34. 34.49² =
  35. 35.39² =
  36. 36.49² =
  37. 37.19² =
  38. 38.59² =
  39. 39.39² =
  40. 40.31² =

Answer key

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

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