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Squares Trick Worksheet

Speed calculation lesson 10: Squares next to a ten · Set 241 · 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. 1.41² =
  2. 2.21² =
  3. 3.91² =
  4. 4.69² =
  5. 5.29² =
  6. 6.21² =
  7. 7.91² =
  8. 8.21² =
  9. 9.31² =
  10. 10.71² =
  11. 11.31² =
  12. 12.49² =
  13. 13.69² =
  14. 14.59² =
  15. 15.91² =
  16. 16.41² =
  17. 17.91² =
  18. 18.61² =
  19. 19.91² =
  20. 20.51² =
  21. 21.19² =
  22. 22.61² =
  23. 23.71² =
  24. 24.39² =
  25. 25.71² =
  26. 26.39² =
  27. 27.39² =
  28. 28.51² =
  29. 29.71² =
  30. 30.29² =
  31. 31.31² =
  32. 32.51² =
  33. 33.29² =
  34. 34.39² =
  35. 35.29² =
  36. 36.19² =
  37. 37.29² =
  38. 38.71² =
  39. 39.21² =
  40. 40.21² =

Answer key

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

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