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Squares Trick Worksheet

Speed calculation lesson 10: Squares next to a ten · Set 753 · 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. 1.31² =
  2. 2.31² =
  3. 3.41² =
  4. 4.29² =
  5. 5.19² =
  6. 6.61² =
  7. 7.31² =
  8. 8.49² =
  9. 9.39² =
  10. 10.39² =
  11. 11.89² =
  12. 12.51² =
  13. 13.59² =
  14. 14.31² =
  15. 15.89² =
  16. 16.79² =
  17. 17.29² =
  18. 18.91² =
  19. 19.19² =
  20. 20.39² =
  21. 21.61² =
  22. 22.79² =
  23. 23.89² =
  24. 24.69² =
  25. 25.59² =
  26. 26.39² =
  27. 27.69² =
  28. 28.61² =
  29. 29.29² =
  30. 30.21² =
  31. 31.41² =
  32. 32.91² =
  33. 33.69² =
  34. 34.49² =
  35. 35.79² =
  36. 36.41² =
  37. 37.81² =
  38. 38.41² =
  39. 39.19² =
  40. 40.81² =

Answer key

  1. 961
  2. 961
  3. 1681
  4. 841
  5. 361
  6. 3721
  7. 961
  8. 2401
  9. 1521
  10. 1521
  11. 7921
  12. 2601
  13. 3481
  14. 961
  15. 7921
  16. 6241
  17. 841
  18. 8281
  19. 361
  20. 1521
  21. 3721
  22. 6241
  23. 7921
  24. 4761
  25. 3481
  26. 1521
  27. 4761
  28. 3721
  29. 841
  30. 441
  31. 1681
  32. 8281
  33. 4761
  34. 2401
  35. 6241
  36. 1681
  37. 6561
  38. 1681
  39. 361
  40. 6561

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