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Squares Trick Worksheet

Speed calculation lesson 10: Squares next to a ten · Set 637 · 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. 3.21² =
  4. 4.19² =
  5. 5.41² =
  6. 6.49² =
  7. 7.49² =
  8. 8.29² =
  9. 9.71² =
  10. 10.91² =
  11. 11.69² =
  12. 12.19² =
  13. 13.71² =
  14. 14.31² =
  15. 15.51² =
  16. 16.61² =
  17. 17.41² =
  18. 18.71² =
  19. 19.61² =
  20. 20.59² =
  21. 21.31² =
  22. 22.29² =
  23. 23.81² =
  24. 24.49² =
  25. 25.71² =
  26. 26.59² =
  27. 27.69² =
  28. 28.31² =
  29. 29.39² =
  30. 30.71² =
  31. 31.21² =
  32. 32.41² =
  33. 33.81² =
  34. 34.89² =
  35. 35.91² =
  36. 36.21² =
  37. 37.91² =
  38. 38.59² =
  39. 39.69² =
  40. 40.69² =

Answer key

  1. 5041
  2. 961
  3. 441
  4. 361
  5. 1681
  6. 2401
  7. 2401
  8. 841
  9. 5041
  10. 8281
  11. 4761
  12. 361
  13. 5041
  14. 961
  15. 2601
  16. 3721
  17. 1681
  18. 5041
  19. 3721
  20. 3481
  21. 961
  22. 841
  23. 6561
  24. 2401
  25. 5041
  26. 3481
  27. 4761
  28. 961
  29. 1521
  30. 5041
  31. 441
  32. 1681
  33. 6561
  34. 7921
  35. 8281
  36. 441
  37. 8281
  38. 3481
  39. 4761
  40. 4761

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