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Squares Trick Worksheet

Speed calculation lesson 10: Squares next to a ten · Set 473 · 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. 1.59² =
  2. 2.81² =
  3. 3.29² =
  4. 4.81² =
  5. 5.41² =
  6. 6.21² =
  7. 7.21² =
  8. 8.49² =
  9. 9.61² =
  10. 10.21² =
  11. 11.61² =
  12. 12.29² =
  13. 13.39² =
  14. 14.71² =
  15. 15.29² =
  16. 16.39² =
  17. 17.49² =
  18. 18.69² =
  19. 19.91² =
  20. 20.21² =
  21. 21.61² =
  22. 22.31² =
  23. 23.49² =
  24. 24.61² =
  25. 25.39² =
  26. 26.89² =
  27. 27.31² =
  28. 28.39² =
  29. 29.61² =
  30. 30.51² =
  31. 31.31² =
  32. 32.89² =
  33. 33.71² =
  34. 34.89² =
  35. 35.81² =
  36. 36.29² =
  37. 37.29² =
  38. 38.21² =
  39. 39.29² =
  40. 40.69² =

Answer key

  1. 3481
  2. 6561
  3. 841
  4. 6561
  5. 1681
  6. 441
  7. 441
  8. 2401
  9. 3721
  10. 441
  11. 3721
  12. 841
  13. 1521
  14. 5041
  15. 841
  16. 1521
  17. 2401
  18. 4761
  19. 8281
  20. 441
  21. 3721
  22. 961
  23. 2401
  24. 3721
  25. 1521
  26. 7921
  27. 961
  28. 1521
  29. 3721
  30. 2601
  31. 961
  32. 7921
  33. 5041
  34. 7921
  35. 6561
  36. 841
  37. 841
  38. 441
  39. 841
  40. 4761

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