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Squares Trick Worksheet

Speed calculation lesson 10: Squares next to a ten · Set 488 · 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. 1.69² =
  2. 2.49² =
  3. 3.31² =
  4. 4.41² =
  5. 5.29² =
  6. 6.21² =
  7. 7.69² =
  8. 8.61² =
  9. 9.89² =
  10. 10.59² =
  11. 11.49² =
  12. 12.31² =
  13. 13.69² =
  14. 14.29² =
  15. 15.61² =
  16. 16.49² =
  17. 17.21² =
  18. 18.41² =
  19. 19.21² =
  20. 20.39² =
  21. 21.41² =
  22. 22.61² =
  23. 23.79² =
  24. 24.31² =
  25. 25.29² =
  26. 26.49² =
  27. 27.79² =
  28. 28.89² =
  29. 29.89² =
  30. 30.39² =
  31. 31.41² =
  32. 32.89² =
  33. 33.19² =
  34. 34.19² =
  35. 35.59² =
  36. 36.89² =
  37. 37.89² =
  38. 38.31² =
  39. 39.89² =
  40. 40.39² =

Answer key

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

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