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Squares Trick Worksheet

Speed calculation lesson 10: Squares next to a ten · Set 727 · 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. 2.31² =
  3. 3.71² =
  4. 4.71² =
  5. 5.19² =
  6. 6.79² =
  7. 7.31² =
  8. 8.19² =
  9. 9.71² =
  10. 10.59² =
  11. 11.29² =
  12. 12.61² =
  13. 13.79² =
  14. 14.29² =
  15. 15.29² =
  16. 16.41² =
  17. 17.91² =
  18. 18.39² =
  19. 19.31² =
  20. 20.89² =
  21. 21.59² =
  22. 22.31² =
  23. 23.19² =
  24. 24.19² =
  25. 25.61² =
  26. 26.61² =
  27. 27.39² =
  28. 28.51² =
  29. 29.51² =
  30. 30.59² =
  31. 31.29² =
  32. 32.19² =
  33. 33.39² =
  34. 34.31² =
  35. 35.69² =
  36. 36.49² =
  37. 37.29² =
  38. 38.39² =
  39. 39.69² =
  40. 40.79² =

Answer key

  1. 6561
  2. 961
  3. 5041
  4. 5041
  5. 361
  6. 6241
  7. 961
  8. 361
  9. 5041
  10. 3481
  11. 841
  12. 3721
  13. 6241
  14. 841
  15. 841
  16. 1681
  17. 8281
  18. 1521
  19. 961
  20. 7921
  21. 3481
  22. 961
  23. 361
  24. 361
  25. 3721
  26. 3721
  27. 1521
  28. 2601
  29. 2601
  30. 3481
  31. 841
  32. 361
  33. 1521
  34. 961
  35. 4761
  36. 2401
  37. 841
  38. 1521
  39. 4761
  40. 6241

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