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Squares Trick Worksheet

Speed calculation lesson 10: Squares next to a ten · Set 65 · 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. 1.89² =
  2. 2.59² =
  3. 3.91² =
  4. 4.89² =
  5. 5.31² =
  6. 6.61² =
  7. 7.21² =
  8. 8.59² =
  9. 9.61² =
  10. 10.29² =
  11. 11.29² =
  12. 12.31² =
  13. 13.59² =
  14. 14.31² =
  15. 15.19² =
  16. 16.31² =
  17. 17.19² =
  18. 18.41² =
  19. 19.41² =
  20. 20.21² =
  21. 21.31² =
  22. 22.51² =
  23. 23.59² =
  24. 24.21² =
  25. 25.59² =
  26. 26.51² =
  27. 27.71² =
  28. 28.89² =
  29. 29.51² =
  30. 30.21² =
  31. 31.79² =
  32. 32.61² =
  33. 33.71² =
  34. 34.51² =
  35. 35.79² =
  36. 36.51² =
  37. 37.39² =
  38. 38.91² =
  39. 39.39² =
  40. 40.31² =

Answer key

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

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