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Squares Trick Worksheet

Speed calculation lesson 10: Squares next to a ten · Set 181 · 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. 1.89² =
  2. 2.81² =
  3. 3.49² =
  4. 4.69² =
  5. 5.19² =
  6. 6.81² =
  7. 7.89² =
  8. 8.59² =
  9. 9.31² =
  10. 10.49² =
  11. 11.79² =
  12. 12.71² =
  13. 13.39² =
  14. 14.39² =
  15. 15.19² =
  16. 16.31² =
  17. 17.89² =
  18. 18.39² =
  19. 19.31² =
  20. 20.29² =
  21. 21.49² =
  22. 22.81² =
  23. 23.21² =
  24. 24.29² =
  25. 25.91² =
  26. 26.41² =
  27. 27.19² =
  28. 28.29² =
  29. 29.41² =
  30. 30.61² =
  31. 31.21² =
  32. 32.61² =
  33. 33.19² =
  34. 34.31² =
  35. 35.21² =
  36. 36.41² =
  37. 37.41² =
  38. 38.41² =
  39. 39.59² =
  40. 40.81² =

Answer key

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

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