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Squares Trick Worksheet

Speed calculation lesson 10: Squares next to a ten · Set 264 · 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. 1.31² =
  2. 2.71² =
  3. 3.61² =
  4. 4.19² =
  5. 5.29² =
  6. 6.41² =
  7. 7.41² =
  8. 8.71² =
  9. 9.19² =
  10. 10.69² =
  11. 11.71² =
  12. 12.41² =
  13. 13.19² =
  14. 14.41² =
  15. 15.29² =
  16. 16.59² =
  17. 17.61² =
  18. 18.61² =
  19. 19.41² =
  20. 20.41² =
  21. 21.29² =
  22. 22.71² =
  23. 23.29² =
  24. 24.29² =
  25. 25.39² =
  26. 26.91² =
  27. 27.31² =
  28. 28.31² =
  29. 29.31² =
  30. 30.59² =
  31. 31.31² =
  32. 32.31² =
  33. 33.31² =
  34. 34.49² =
  35. 35.19² =
  36. 36.49² =
  37. 37.29² =
  38. 38.49² =
  39. 39.31² =
  40. 40.79² =

Answer key

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

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