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Squares Trick Worksheet

Speed calculation lesson 10: Squares next to a ten · Set 547 · 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. 2.79² =
  3. 3.81² =
  4. 4.71² =
  5. 5.31² =
  6. 6.59² =
  7. 7.91² =
  8. 8.31² =
  9. 9.19² =
  10. 10.21² =
  11. 11.91² =
  12. 12.21² =
  13. 13.79² =
  14. 14.61² =
  15. 15.29² =
  16. 16.81² =
  17. 17.29² =
  18. 18.89² =
  19. 19.89² =
  20. 20.31² =
  21. 21.39² =
  22. 22.59² =
  23. 23.21² =
  24. 24.79² =
  25. 25.91² =
  26. 26.19² =
  27. 27.79² =
  28. 28.51² =
  29. 29.71² =
  30. 30.31² =
  31. 31.89² =
  32. 32.69² =
  33. 33.31² =
  34. 34.59² =
  35. 35.51² =
  36. 36.49² =
  37. 37.31² =
  38. 38.41² =
  39. 39.21² =
  40. 40.59² =

Answer key

  1. 961
  2. 6241
  3. 6561
  4. 5041
  5. 961
  6. 3481
  7. 8281
  8. 961
  9. 361
  10. 441
  11. 8281
  12. 441
  13. 6241
  14. 3721
  15. 841
  16. 6561
  17. 841
  18. 7921
  19. 7921
  20. 961
  21. 1521
  22. 3481
  23. 441
  24. 6241
  25. 8281
  26. 361
  27. 6241
  28. 2601
  29. 5041
  30. 961
  31. 7921
  32. 4761
  33. 961
  34. 3481
  35. 2601
  36. 2401
  37. 961
  38. 1681
  39. 441
  40. 3481

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