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Squares Trick Worksheet

Speed calculation lesson 10: Squares next to a ten · Set 801 · 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. 1.31² =
  2. 2.31² =
  3. 3.81² =
  4. 4.59² =
  5. 5.91² =
  6. 6.69² =
  7. 7.31² =
  8. 8.19² =
  9. 9.29² =
  10. 10.49² =
  11. 11.91² =
  12. 12.41² =
  13. 13.91² =
  14. 14.49² =
  15. 15.21² =
  16. 16.59² =
  17. 17.39² =
  18. 18.51² =
  19. 19.69² =
  20. 20.61² =
  21. 21.79² =
  22. 22.91² =
  23. 23.69² =
  24. 24.59² =
  25. 25.79² =
  26. 26.79² =
  27. 27.79² =
  28. 28.59² =
  29. 29.89² =
  30. 30.91² =
  31. 31.51² =
  32. 32.61² =
  33. 33.19² =
  34. 34.61² =
  35. 35.51² =
  36. 36.29² =
  37. 37.19² =
  38. 38.89² =
  39. 39.41² =
  40. 40.59² =

Answer key

  1. 961
  2. 961
  3. 6561
  4. 3481
  5. 8281
  6. 4761
  7. 961
  8. 361
  9. 841
  10. 2401
  11. 8281
  12. 1681
  13. 8281
  14. 2401
  15. 441
  16. 3481
  17. 1521
  18. 2601
  19. 4761
  20. 3721
  21. 6241
  22. 8281
  23. 4761
  24. 3481
  25. 6241
  26. 6241
  27. 6241
  28. 3481
  29. 7921
  30. 8281
  31. 2601
  32. 3721
  33. 361
  34. 3721
  35. 2601
  36. 841
  37. 361
  38. 7921
  39. 1681
  40. 3481

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