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Squares Trick Worksheet

Speed calculation lesson 10: Squares next to a ten · Set 504 · 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. 2.89² =
  3. 3.71² =
  4. 4.59² =
  5. 5.81² =
  6. 6.79² =
  7. 7.41² =
  8. 8.31² =
  9. 9.29² =
  10. 10.21² =
  11. 11.49² =
  12. 12.49² =
  13. 13.31² =
  14. 14.69² =
  15. 15.79² =
  16. 16.39² =
  17. 17.81² =
  18. 18.81² =
  19. 19.59² =
  20. 20.29² =
  21. 21.69² =
  22. 22.51² =
  23. 23.69² =
  24. 24.71² =
  25. 25.69² =
  26. 26.21² =
  27. 27.61² =
  28. 28.79² =
  29. 29.41² =
  30. 30.39² =
  31. 31.31² =
  32. 32.51² =
  33. 33.51² =
  34. 34.59² =
  35. 35.79² =
  36. 36.39² =
  37. 37.49² =
  38. 38.81² =
  39. 39.29² =
  40. 40.39² =

Answer key

  1. 7921
  2. 7921
  3. 5041
  4. 3481
  5. 6561
  6. 6241
  7. 1681
  8. 961
  9. 841
  10. 441
  11. 2401
  12. 2401
  13. 961
  14. 4761
  15. 6241
  16. 1521
  17. 6561
  18. 6561
  19. 3481
  20. 841
  21. 4761
  22. 2601
  23. 4761
  24. 5041
  25. 4761
  26. 441
  27. 3721
  28. 6241
  29. 1681
  30. 1521
  31. 961
  32. 2601
  33. 2601
  34. 3481
  35. 6241
  36. 1521
  37. 2401
  38. 6561
  39. 841
  40. 1521

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