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Squares Trick Worksheet

Speed calculation lesson 10: Squares next to a ten · Set 427 · 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. 1.71² =
  2. 2.31² =
  3. 3.29² =
  4. 4.81² =
  5. 5.61² =
  6. 6.59² =
  7. 7.29² =
  8. 8.21² =
  9. 9.81² =
  10. 10.19² =
  11. 11.69² =
  12. 12.19² =
  13. 13.79² =
  14. 14.61² =
  15. 15.31² =
  16. 16.19² =
  17. 17.39² =
  18. 18.41² =
  19. 19.89² =
  20. 20.69² =
  21. 21.31² =
  22. 22.41² =
  23. 23.29² =
  24. 24.59² =
  25. 25.29² =
  26. 26.41² =
  27. 27.81² =
  28. 28.19² =
  29. 29.91² =
  30. 30.29² =
  31. 31.49² =
  32. 32.71² =
  33. 33.91² =
  34. 34.59² =
  35. 35.41² =
  36. 36.59² =
  37. 37.79² =
  38. 38.51² =
  39. 39.39² =
  40. 40.31² =

Answer key

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

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