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Squares Trick Worksheet

Speed calculation lesson 10: Squares next to a ten · Set 240 · 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. 1.49² =
  2. 2.39² =
  3. 3.39² =
  4. 4.89² =
  5. 5.49² =
  6. 6.49² =
  7. 7.69² =
  8. 8.69² =
  9. 9.61² =
  10. 10.51² =
  11. 11.19² =
  12. 12.81² =
  13. 13.41² =
  14. 14.29² =
  15. 15.19² =
  16. 16.89² =
  17. 17.39² =
  18. 18.29² =
  19. 19.41² =
  20. 20.59² =
  21. 21.81² =
  22. 22.31² =
  23. 23.79² =
  24. 24.79² =
  25. 25.91² =
  26. 26.41² =
  27. 27.81² =
  28. 28.61² =
  29. 29.51² =
  30. 30.31² =
  31. 31.29² =
  32. 32.29² =
  33. 33.69² =
  34. 34.39² =
  35. 35.31² =
  36. 36.31² =
  37. 37.69² =
  38. 38.31² =
  39. 39.29² =
  40. 40.89² =

Answer key

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

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