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Squares Trick Worksheet

Speed calculation lesson 10: Squares next to a ten · Set 43 · 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. 2.41² =
  3. 3.29² =
  4. 4.89² =
  5. 5.91² =
  6. 6.49² =
  7. 7.51² =
  8. 8.91² =
  9. 9.19² =
  10. 10.21² =
  11. 11.91² =
  12. 12.21² =
  13. 13.39² =
  14. 14.19² =
  15. 15.81² =
  16. 16.21² =
  17. 17.19² =
  18. 18.19² =
  19. 19.39² =
  20. 20.39² =
  21. 21.69² =
  22. 22.69² =
  23. 23.81² =
  24. 24.81² =
  25. 25.31² =
  26. 26.49² =
  27. 27.81² =
  28. 28.49² =
  29. 29.69² =
  30. 30.41² =
  31. 31.69² =
  32. 32.39² =
  33. 33.61² =
  34. 34.31² =
  35. 35.69² =
  36. 36.89² =
  37. 37.29² =
  38. 38.81² =
  39. 39.59² =
  40. 40.29² =

Answer key

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

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