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Squares Trick Worksheet

Speed calculation lesson 10: Squares next to a ten · Set 8 · 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. 1.81² =
  2. 2.19² =
  3. 3.41² =
  4. 4.41² =
  5. 5.69² =
  6. 6.49² =
  7. 7.79² =
  8. 8.21² =
  9. 9.81² =
  10. 10.41² =
  11. 11.39² =
  12. 12.51² =
  13. 13.19² =
  14. 14.69² =
  15. 15.29² =
  16. 16.69² =
  17. 17.29² =
  18. 18.41² =
  19. 19.69² =
  20. 20.81² =
  21. 21.79² =
  22. 22.31² =
  23. 23.71² =
  24. 24.31² =
  25. 25.51² =
  26. 26.31² =
  27. 27.39² =
  28. 28.21² =
  29. 29.91² =
  30. 30.41² =
  31. 31.29² =
  32. 32.69² =
  33. 33.89² =
  34. 34.51² =
  35. 35.71² =
  36. 36.81² =
  37. 37.19² =
  38. 38.31² =
  39. 39.89² =
  40. 40.69² =

Answer key

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

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