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Squares Trick Worksheet

Speed calculation lesson 10: Squares next to a ten · Set 662 · 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. 1.81² =
  2. 2.21² =
  3. 3.21² =
  4. 4.41² =
  5. 5.21² =
  6. 6.59² =
  7. 7.89² =
  8. 8.21² =
  9. 9.31² =
  10. 10.19² =
  11. 11.81² =
  12. 12.51² =
  13. 13.81² =
  14. 14.49² =
  15. 15.31² =
  16. 16.79² =
  17. 17.31² =
  18. 18.59² =
  19. 19.71² =
  20. 20.69² =
  21. 21.31² =
  22. 22.69² =
  23. 23.39² =
  24. 24.49² =
  25. 25.49² =
  26. 26.69² =
  27. 27.81² =
  28. 28.51² =
  29. 29.51² =
  30. 30.31² =
  31. 31.81² =
  32. 32.41² =
  33. 33.51² =
  34. 34.31² =
  35. 35.49² =
  36. 36.19² =
  37. 37.19² =
  38. 38.41² =
  39. 39.81² =
  40. 40.69² =

Answer key

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

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