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Squares Trick Worksheet

Speed calculation lesson 10: Squares next to a ten · Set 507 · 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. 2.81² =
  3. 3.19² =
  4. 4.61² =
  5. 5.19² =
  6. 6.29² =
  7. 7.29² =
  8. 8.71² =
  9. 9.51² =
  10. 10.49² =
  11. 11.19² =
  12. 12.81² =
  13. 13.89² =
  14. 14.29² =
  15. 15.39² =
  16. 16.49² =
  17. 17.69² =
  18. 18.39² =
  19. 19.31² =
  20. 20.29² =
  21. 21.59² =
  22. 22.39² =
  23. 23.81² =
  24. 24.21² =
  25. 25.51² =
  26. 26.31² =
  27. 27.71² =
  28. 28.21² =
  29. 29.89² =
  30. 30.91² =
  31. 31.29² =
  32. 32.59² =
  33. 33.81² =
  34. 34.79² =
  35. 35.69² =
  36. 36.41² =
  37. 37.81² =
  38. 38.41² =
  39. 39.49² =
  40. 40.41² =

Answer key

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

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