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Squares Trick Worksheet

Speed calculation lesson 10: Squares next to a ten · Set 686 · 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. 2.69² =
  3. 3.69² =
  4. 4.19² =
  5. 5.21² =
  6. 6.29² =
  7. 7.71² =
  8. 8.41² =
  9. 9.41² =
  10. 10.59² =
  11. 11.39² =
  12. 12.59² =
  13. 13.81² =
  14. 14.49² =
  15. 15.89² =
  16. 16.21² =
  17. 17.29² =
  18. 18.29² =
  19. 19.51² =
  20. 20.21² =
  21. 21.39² =
  22. 22.59² =
  23. 23.49² =
  24. 24.79² =
  25. 25.31² =
  26. 26.29² =
  27. 27.19² =
  28. 28.39² =
  29. 29.41² =
  30. 30.59² =
  31. 31.29² =
  32. 32.29² =
  33. 33.21² =
  34. 34.19² =
  35. 35.49² =
  36. 36.29² =
  37. 37.61² =
  38. 38.79² =
  39. 39.89² =
  40. 40.39² =

Answer key

  1. 6241
  2. 4761
  3. 4761
  4. 361
  5. 441
  6. 841
  7. 5041
  8. 1681
  9. 1681
  10. 3481
  11. 1521
  12. 3481
  13. 6561
  14. 2401
  15. 7921
  16. 441
  17. 841
  18. 841
  19. 2601
  20. 441
  21. 1521
  22. 3481
  23. 2401
  24. 6241
  25. 961
  26. 841
  27. 361
  28. 1521
  29. 1681
  30. 3481
  31. 841
  32. 841
  33. 441
  34. 361
  35. 2401
  36. 841
  37. 3721
  38. 6241
  39. 7921
  40. 1521

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