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Squares Trick Worksheet

Speed calculation lesson 10: Squares next to a ten · Set 131 · 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. 2.41² =
  3. 3.79² =
  4. 4.21² =
  5. 5.81² =
  6. 6.21² =
  7. 7.59² =
  8. 8.39² =
  9. 9.39² =
  10. 10.61² =
  11. 11.81² =
  12. 12.39² =
  13. 13.19² =
  14. 14.21² =
  15. 15.59² =
  16. 16.59² =
  17. 17.61² =
  18. 18.41² =
  19. 19.59² =
  20. 20.49² =
  21. 21.29² =
  22. 22.41² =
  23. 23.71² =
  24. 24.71² =
  25. 25.29² =
  26. 26.81² =
  27. 27.39² =
  28. 28.31² =
  29. 29.41² =
  30. 30.29² =
  31. 31.61² =
  32. 32.71² =
  33. 33.41² =
  34. 34.31² =
  35. 35.79² =
  36. 36.29² =
  37. 37.49² =
  38. 38.71² =
  39. 39.21² =
  40. 40.39² =

Answer key

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

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