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Squares Trick Worksheet

Speed calculation lesson 10: Squares next to a ten · Set 748 · 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. 1.71² =
  2. 2.31² =
  3. 3.51² =
  4. 4.61² =
  5. 5.29² =
  6. 6.51² =
  7. 7.39² =
  8. 8.51² =
  9. 9.81² =
  10. 10.19² =
  11. 11.19² =
  12. 12.31² =
  13. 13.51² =
  14. 14.21² =
  15. 15.79² =
  16. 16.61² =
  17. 17.59² =
  18. 18.51² =
  19. 19.39² =
  20. 20.19² =
  21. 21.89² =
  22. 22.39² =
  23. 23.19² =
  24. 24.21² =
  25. 25.79² =
  26. 26.89² =
  27. 27.41² =
  28. 28.21² =
  29. 29.81² =
  30. 30.49² =
  31. 31.29² =
  32. 32.41² =
  33. 33.69² =
  34. 34.41² =
  35. 35.81² =
  36. 36.49² =
  37. 37.89² =
  38. 38.81² =
  39. 39.79² =
  40. 40.31² =

Answer key

  1. 5041
  2. 961
  3. 2601
  4. 3721
  5. 841
  6. 2601
  7. 1521
  8. 2601
  9. 6561
  10. 361
  11. 361
  12. 961
  13. 2601
  14. 441
  15. 6241
  16. 3721
  17. 3481
  18. 2601
  19. 1521
  20. 361
  21. 7921
  22. 1521
  23. 361
  24. 441
  25. 6241
  26. 7921
  27. 1681
  28. 441
  29. 6561
  30. 2401
  31. 841
  32. 1681
  33. 4761
  34. 1681
  35. 6561
  36. 2401
  37. 7921
  38. 6561
  39. 6241
  40. 961

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