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Squares Trick Worksheet

Speed calculation lesson 10: Squares next to a ten · Set 732 · 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. 2.69² =
  3. 3.89² =
  4. 4.29² =
  5. 5.31² =
  6. 6.21² =
  7. 7.29² =
  8. 8.71² =
  9. 9.69² =
  10. 10.49² =
  11. 11.81² =
  12. 12.39² =
  13. 13.61² =
  14. 14.79² =
  15. 15.19² =
  16. 16.81² =
  17. 17.89² =
  18. 18.71² =
  19. 19.31² =
  20. 20.79² =
  21. 21.59² =
  22. 22.69² =
  23. 23.39² =
  24. 24.49² =
  25. 25.71² =
  26. 26.59² =
  27. 27.21² =
  28. 28.29² =
  29. 29.51² =
  30. 30.41² =
  31. 31.81² =
  32. 32.31² =
  33. 33.51² =
  34. 34.31² =
  35. 35.81² =
  36. 36.71² =
  37. 37.71² =
  38. 38.49² =
  39. 39.81² =
  40. 40.59² =

Answer key

  1. 5041
  2. 4761
  3. 7921
  4. 841
  5. 961
  6. 441
  7. 841
  8. 5041
  9. 4761
  10. 2401
  11. 6561
  12. 1521
  13. 3721
  14. 6241
  15. 361
  16. 6561
  17. 7921
  18. 5041
  19. 961
  20. 6241
  21. 3481
  22. 4761
  23. 1521
  24. 2401
  25. 5041
  26. 3481
  27. 441
  28. 841
  29. 2601
  30. 1681
  31. 6561
  32. 961
  33. 2601
  34. 961
  35. 6561
  36. 5041
  37. 5041
  38. 2401
  39. 6561
  40. 3481

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