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Squares Trick Worksheet

Speed calculation lesson 10: Squares next to a ten · Set 539 · 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. 2.29² =
  3. 3.61² =
  4. 4.91² =
  5. 5.21² =
  6. 6.49² =
  7. 7.29² =
  8. 8.31² =
  9. 9.31² =
  10. 10.59² =
  11. 11.31² =
  12. 12.49² =
  13. 13.51² =
  14. 14.89² =
  15. 15.29² =
  16. 16.79² =
  17. 17.51² =
  18. 18.49² =
  19. 19.81² =
  20. 20.81² =
  21. 21.91² =
  22. 22.61² =
  23. 23.41² =
  24. 24.61² =
  25. 25.19² =
  26. 26.29² =
  27. 27.31² =
  28. 28.29² =
  29. 29.19² =
  30. 30.31² =
  31. 31.31² =
  32. 32.89² =
  33. 33.59² =
  34. 34.61² =
  35. 35.29² =
  36. 36.29² =
  37. 37.29² =
  38. 38.71² =
  39. 39.19² =
  40. 40.29² =

Answer key

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

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