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Squares Trick Worksheet

Speed calculation lesson 10: Squares next to a ten · Set 704 · 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. 2.69² =
  3. 3.71² =
  4. 4.29² =
  5. 5.69² =
  6. 6.59² =
  7. 7.41² =
  8. 8.31² =
  9. 9.89² =
  10. 10.39² =
  11. 11.61² =
  12. 12.21² =
  13. 13.19² =
  14. 14.39² =
  15. 15.21² =
  16. 16.81² =
  17. 17.69² =
  18. 18.41² =
  19. 19.31² =
  20. 20.19² =
  21. 21.49² =
  22. 22.29² =
  23. 23.41² =
  24. 24.69² =
  25. 25.29² =
  26. 26.69² =
  27. 27.69² =
  28. 28.59² =
  29. 29.81² =
  30. 30.39² =
  31. 31.81² =
  32. 32.41² =
  33. 33.69² =
  34. 34.21² =
  35. 35.69² =
  36. 36.79² =
  37. 37.89² =
  38. 38.89² =
  39. 39.41² =
  40. 40.21² =

Answer key

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

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