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Squares Trick Worksheet

Speed calculation lesson 10: Squares next to a ten · Set 664 · 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. 1.31² =
  2. 2.31² =
  3. 3.71² =
  4. 4.39² =
  5. 5.61² =
  6. 6.61² =
  7. 7.81² =
  8. 8.71² =
  9. 9.71² =
  10. 10.49² =
  11. 11.81² =
  12. 12.21² =
  13. 13.41² =
  14. 14.51² =
  15. 15.41² =
  16. 16.29² =
  17. 17.49² =
  18. 18.81² =
  19. 19.19² =
  20. 20.61² =
  21. 21.81² =
  22. 22.31² =
  23. 23.41² =
  24. 24.29² =
  25. 25.89² =
  26. 26.29² =
  27. 27.29² =
  28. 28.21² =
  29. 29.21² =
  30. 30.79² =
  31. 31.31² =
  32. 32.49² =
  33. 33.29² =
  34. 34.69² =
  35. 35.49² =
  36. 36.51² =
  37. 37.19² =
  38. 38.19² =
  39. 39.19² =
  40. 40.59² =

Answer key

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

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