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Squares Trick Worksheet

Speed calculation lesson 10: Squares next to a ten · Set 868 · 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. 1.89² =
  2. 2.21² =
  3. 3.61² =
  4. 4.71² =
  5. 5.21² =
  6. 6.69² =
  7. 7.31² =
  8. 8.39² =
  9. 9.59² =
  10. 10.51² =
  11. 11.21² =
  12. 12.21² =
  13. 13.19² =
  14. 14.49² =
  15. 15.51² =
  16. 16.21² =
  17. 17.59² =
  18. 18.59² =
  19. 19.49² =
  20. 20.41² =
  21. 21.71² =
  22. 22.69² =
  23. 23.51² =
  24. 24.61² =
  25. 25.71² =
  26. 26.59² =
  27. 27.49² =
  28. 28.29² =
  29. 29.41² =
  30. 30.21² =
  31. 31.81² =
  32. 32.81² =
  33. 33.59² =
  34. 34.31² =
  35. 35.39² =
  36. 36.41² =
  37. 37.39² =
  38. 38.29² =
  39. 39.19² =
  40. 40.51² =

Answer key

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

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