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Squares Trick Worksheet

Speed calculation lesson 10: Squares next to a ten · Set 680 · 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. 2.49² =
  3. 3.41² =
  4. 4.81² =
  5. 5.91² =
  6. 6.91² =
  7. 7.41² =
  8. 8.71² =
  9. 9.81² =
  10. 10.19² =
  11. 11.31² =
  12. 12.19² =
  13. 13.31² =
  14. 14.31² =
  15. 15.29² =
  16. 16.41² =
  17. 17.69² =
  18. 18.61² =
  19. 19.41² =
  20. 20.69² =
  21. 21.71² =
  22. 22.51² =
  23. 23.29² =
  24. 24.71² =
  25. 25.29² =
  26. 26.69² =
  27. 27.91² =
  28. 28.31² =
  29. 29.91² =
  30. 30.21² =
  31. 31.61² =
  32. 32.69² =
  33. 33.21² =
  34. 34.39² =
  35. 35.59² =
  36. 36.71² =
  37. 37.61² =
  38. 38.31² =
  39. 39.31² =
  40. 40.91² =

Answer key

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

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