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Squares Trick Worksheet

Speed calculation lesson 10: Squares next to a ten · Set 475 · 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. 1.49² =
  2. 2.61² =
  3. 3.39² =
  4. 4.31² =
  5. 5.59² =
  6. 6.59² =
  7. 7.81² =
  8. 8.39² =
  9. 9.41² =
  10. 10.61² =
  11. 11.51² =
  12. 12.79² =
  13. 13.41² =
  14. 14.39² =
  15. 15.49² =
  16. 16.19² =
  17. 17.89² =
  18. 18.89² =
  19. 19.19² =
  20. 20.31² =
  21. 21.89² =
  22. 22.29² =
  23. 23.91² =
  24. 24.79² =
  25. 25.59² =
  26. 26.29² =
  27. 27.21² =
  28. 28.31² =
  29. 29.91² =
  30. 30.51² =
  31. 31.29² =
  32. 32.21² =
  33. 33.61² =
  34. 34.79² =
  35. 35.59² =
  36. 36.59² =
  37. 37.59² =
  38. 38.79² =
  39. 39.19² =
  40. 40.29² =

Answer key

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

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