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Squares Trick Worksheet

Speed calculation lesson 10: Squares next to a ten · Set 527 · 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. 2.79² =
  3. 3.41² =
  4. 4.81² =
  5. 5.31² =
  6. 6.69² =
  7. 7.61² =
  8. 8.79² =
  9. 9.29² =
  10. 10.31² =
  11. 11.69² =
  12. 12.29² =
  13. 13.31² =
  14. 14.79² =
  15. 15.69² =
  16. 16.19² =
  17. 17.59² =
  18. 18.41² =
  19. 19.89² =
  20. 20.21² =
  21. 21.81² =
  22. 22.69² =
  23. 23.89² =
  24. 24.39² =
  25. 25.19² =
  26. 26.29² =
  27. 27.39² =
  28. 28.59² =
  29. 29.81² =
  30. 30.79² =
  31. 31.31² =
  32. 32.89² =
  33. 33.91² =
  34. 34.61² =
  35. 35.41² =
  36. 36.81² =
  37. 37.41² =
  38. 38.89² =
  39. 39.51² =
  40. 40.49² =

Answer key

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

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