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Squares Trick Worksheet

Speed calculation lesson 10: Squares next to a ten · Set 791 · 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. 2.39² =
  3. 3.79² =
  4. 4.19² =
  5. 5.49² =
  6. 6.61² =
  7. 7.61² =
  8. 8.21² =
  9. 9.19² =
  10. 10.81² =
  11. 11.59² =
  12. 12.49² =
  13. 13.29² =
  14. 14.39² =
  15. 15.81² =
  16. 16.69² =
  17. 17.49² =
  18. 18.89² =
  19. 19.69² =
  20. 20.81² =
  21. 21.69² =
  22. 22.31² =
  23. 23.31² =
  24. 24.59² =
  25. 25.19² =
  26. 26.41² =
  27. 27.29² =
  28. 28.19² =
  29. 29.69² =
  30. 30.29² =
  31. 31.59² =
  32. 32.69² =
  33. 33.91² =
  34. 34.79² =
  35. 35.89² =
  36. 36.39² =
  37. 37.29² =
  38. 38.41² =
  39. 39.31² =
  40. 40.39² =

Answer key

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

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