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Squares Trick Worksheet

Speed calculation lesson 10: Squares next to a ten · Set 535 · 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. 1.91² =
  2. 2.69² =
  3. 3.89² =
  4. 4.39² =
  5. 5.39² =
  6. 6.79² =
  7. 7.29² =
  8. 8.69² =
  9. 9.29² =
  10. 10.31² =
  11. 11.79² =
  12. 12.51² =
  13. 13.31² =
  14. 14.29² =
  15. 15.39² =
  16. 16.51² =
  17. 17.69² =
  18. 18.59² =
  19. 19.69² =
  20. 20.51² =
  21. 21.31² =
  22. 22.19² =
  23. 23.31² =
  24. 24.31² =
  25. 25.81² =
  26. 26.91² =
  27. 27.69² =
  28. 28.69² =
  29. 29.41² =
  30. 30.29² =
  31. 31.49² =
  32. 32.69² =
  33. 33.81² =
  34. 34.41² =
  35. 35.29² =
  36. 36.71² =
  37. 37.21² =
  38. 38.81² =
  39. 39.69² =
  40. 40.69² =

Answer key

  1. 8281
  2. 4761
  3. 7921
  4. 1521
  5. 1521
  6. 6241
  7. 841
  8. 4761
  9. 841
  10. 961
  11. 6241
  12. 2601
  13. 961
  14. 841
  15. 1521
  16. 2601
  17. 4761
  18. 3481
  19. 4761
  20. 2601
  21. 961
  22. 361
  23. 961
  24. 961
  25. 6561
  26. 8281
  27. 4761
  28. 4761
  29. 1681
  30. 841
  31. 2401
  32. 4761
  33. 6561
  34. 1681
  35. 841
  36. 5041
  37. 441
  38. 6561
  39. 4761
  40. 4761

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