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Squares Trick Worksheet

Speed calculation lesson 10: Squares next to a ten · Set 746 · 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. 1.29² =
  2. 2.81² =
  3. 3.89² =
  4. 4.31² =
  5. 5.29² =
  6. 6.91² =
  7. 7.69² =
  8. 8.29² =
  9. 9.61² =
  10. 10.21² =
  11. 11.49² =
  12. 12.79² =
  13. 13.79² =
  14. 14.19² =
  15. 15.61² =
  16. 16.39² =
  17. 17.69² =
  18. 18.29² =
  19. 19.51² =
  20. 20.29² =
  21. 21.41² =
  22. 22.41² =
  23. 23.51² =
  24. 24.21² =
  25. 25.59² =
  26. 26.39² =
  27. 27.59² =
  28. 28.49² =
  29. 29.41² =
  30. 30.81² =
  31. 31.89² =
  32. 32.91² =
  33. 33.19² =
  34. 34.51² =
  35. 35.31² =
  36. 36.81² =
  37. 37.19² =
  38. 38.71² =
  39. 39.41² =
  40. 40.31² =

Answer key

  1. 841
  2. 6561
  3. 7921
  4. 961
  5. 841
  6. 8281
  7. 4761
  8. 841
  9. 3721
  10. 441
  11. 2401
  12. 6241
  13. 6241
  14. 361
  15. 3721
  16. 1521
  17. 4761
  18. 841
  19. 2601
  20. 841
  21. 1681
  22. 1681
  23. 2601
  24. 441
  25. 3481
  26. 1521
  27. 3481
  28. 2401
  29. 1681
  30. 6561
  31. 7921
  32. 8281
  33. 361
  34. 2601
  35. 961
  36. 6561
  37. 361
  38. 5041
  39. 1681
  40. 961

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