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Squares Trick Worksheet

Speed calculation lesson 10: Squares next to a ten · Set 717 · 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. 1.19² =
  2. 2.29² =
  3. 3.71² =
  4. 4.49² =
  5. 5.39² =
  6. 6.31² =
  7. 7.49² =
  8. 8.29² =
  9. 9.91² =
  10. 10.49² =
  11. 11.51² =
  12. 12.91² =
  13. 13.69² =
  14. 14.71² =
  15. 15.81² =
  16. 16.61² =
  17. 17.59² =
  18. 18.31² =
  19. 19.51² =
  20. 20.51² =
  21. 21.89² =
  22. 22.61² =
  23. 23.69² =
  24. 24.51² =
  25. 25.41² =
  26. 26.19² =
  27. 27.41² =
  28. 28.19² =
  29. 29.29² =
  30. 30.89² =
  31. 31.29² =
  32. 32.19² =
  33. 33.91² =
  34. 34.31² =
  35. 35.19² =
  36. 36.79² =
  37. 37.81² =
  38. 38.41² =
  39. 39.41² =
  40. 40.41² =

Answer key

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

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