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Squares Trick Worksheet

Speed calculation lesson 10: Squares next to a ten · Set 556 · 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. 2.79² =
  3. 3.41² =
  4. 4.41² =
  5. 5.19² =
  6. 6.71² =
  7. 7.31² =
  8. 8.41² =
  9. 9.59² =
  10. 10.81² =
  11. 11.49² =
  12. 12.29² =
  13. 13.59² =
  14. 14.19² =
  15. 15.49² =
  16. 16.21² =
  17. 17.79² =
  18. 18.41² =
  19. 19.59² =
  20. 20.51² =
  21. 21.59² =
  22. 22.81² =
  23. 23.29² =
  24. 24.19² =
  25. 25.69² =
  26. 26.61² =
  27. 27.89² =
  28. 28.21² =
  29. 29.41² =
  30. 30.69² =
  31. 31.71² =
  32. 32.71² =
  33. 33.39² =
  34. 34.31² =
  35. 35.79² =
  36. 36.21² =
  37. 37.21² =
  38. 38.89² =
  39. 39.31² =
  40. 40.31² =

Answer key

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

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