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Squares Trick Worksheet

Speed calculation lesson 10: Squares next to a ten · Set 479 · 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. 1.51² =
  2. 2.31² =
  3. 3.31² =
  4. 4.41² =
  5. 5.89² =
  6. 6.41² =
  7. 7.91² =
  8. 8.19² =
  9. 9.81² =
  10. 10.39² =
  11. 11.49² =
  12. 12.41² =
  13. 13.69² =
  14. 14.31² =
  15. 15.29² =
  16. 16.61² =
  17. 17.51² =
  18. 18.89² =
  19. 19.19² =
  20. 20.31² =
  21. 21.21² =
  22. 22.51² =
  23. 23.39² =
  24. 24.61² =
  25. 25.59² =
  26. 26.69² =
  27. 27.61² =
  28. 28.79² =
  29. 29.79² =
  30. 30.29² =
  31. 31.49² =
  32. 32.51² =
  33. 33.41² =
  34. 34.89² =
  35. 35.19² =
  36. 36.69² =
  37. 37.89² =
  38. 38.51² =
  39. 39.19² =
  40. 40.29² =

Answer key

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

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