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Squares Trick Worksheet

Speed calculation lesson 10: Squares next to a ten · Set 740 · 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. 1.59² =
  2. 2.31² =
  3. 3.79² =
  4. 4.31² =
  5. 5.49² =
  6. 6.79² =
  7. 7.51² =
  8. 8.61² =
  9. 9.81² =
  10. 10.91² =
  11. 11.49² =
  12. 12.51² =
  13. 13.79² =
  14. 14.91² =
  15. 15.19² =
  16. 16.19² =
  17. 17.69² =
  18. 18.19² =
  19. 19.31² =
  20. 20.29² =
  21. 21.49² =
  22. 22.49² =
  23. 23.39² =
  24. 24.31² =
  25. 25.19² =
  26. 26.31² =
  27. 27.69² =
  28. 28.49² =
  29. 29.41² =
  30. 30.39² =
  31. 31.29² =
  32. 32.39² =
  33. 33.29² =
  34. 34.29² =
  35. 35.21² =
  36. 36.59² =
  37. 37.31² =
  38. 38.29² =
  39. 39.71² =
  40. 40.41² =

Answer key

  1. 3481
  2. 961
  3. 6241
  4. 961
  5. 2401
  6. 6241
  7. 2601
  8. 3721
  9. 6561
  10. 8281
  11. 2401
  12. 2601
  13. 6241
  14. 8281
  15. 361
  16. 361
  17. 4761
  18. 361
  19. 961
  20. 841
  21. 2401
  22. 2401
  23. 1521
  24. 961
  25. 361
  26. 961
  27. 4761
  28. 2401
  29. 1681
  30. 1521
  31. 841
  32. 1521
  33. 841
  34. 841
  35. 441
  36. 3481
  37. 961
  38. 841
  39. 5041
  40. 1681

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