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Squares Trick Worksheet

Speed calculation lesson 10: Squares next to a ten · Set 747 · 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. 2.19² =
  3. 3.89² =
  4. 4.61² =
  5. 5.19² =
  6. 6.41² =
  7. 7.19² =
  8. 8.59² =
  9. 9.79² =
  10. 10.59² =
  11. 11.19² =
  12. 12.81² =
  13. 13.29² =
  14. 14.89² =
  15. 15.29² =
  16. 16.71² =
  17. 17.91² =
  18. 18.31² =
  19. 19.41² =
  20. 20.29² =
  21. 21.49² =
  22. 22.29² =
  23. 23.31² =
  24. 24.89² =
  25. 25.31² =
  26. 26.89² =
  27. 27.69² =
  28. 28.69² =
  29. 29.39² =
  30. 30.91² =
  31. 31.21² =
  32. 32.69² =
  33. 33.41² =
  34. 34.29² =
  35. 35.21² =
  36. 36.81² =
  37. 37.81² =
  38. 38.81² =
  39. 39.41² =
  40. 40.39² =

Answer key

  1. 5041
  2. 361
  3. 7921
  4. 3721
  5. 361
  6. 1681
  7. 361
  8. 3481
  9. 6241
  10. 3481
  11. 361
  12. 6561
  13. 841
  14. 7921
  15. 841
  16. 5041
  17. 8281
  18. 961
  19. 1681
  20. 841
  21. 2401
  22. 841
  23. 961
  24. 7921
  25. 961
  26. 7921
  27. 4761
  28. 4761
  29. 1521
  30. 8281
  31. 441
  32. 4761
  33. 1681
  34. 841
  35. 441
  36. 6561
  37. 6561
  38. 6561
  39. 1681
  40. 1521

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