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Squares Trick Worksheet

Speed calculation lesson 10: Squares next to a ten · Set 109 · 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. 1.61² =
  2. 2.29² =
  3. 3.51² =
  4. 4.89² =
  5. 5.61² =
  6. 6.79² =
  7. 7.29² =
  8. 8.21² =
  9. 9.89² =
  10. 10.49² =
  11. 11.29² =
  12. 12.69² =
  13. 13.89² =
  14. 14.21² =
  15. 15.49² =
  16. 16.69² =
  17. 17.81² =
  18. 18.41² =
  19. 19.41² =
  20. 20.19² =
  21. 21.89² =
  22. 22.81² =
  23. 23.21² =
  24. 24.79² =
  25. 25.59² =
  26. 26.29² =
  27. 27.41² =
  28. 28.21² =
  29. 29.69² =
  30. 30.71² =
  31. 31.61² =
  32. 32.19² =
  33. 33.41² =
  34. 34.21² =
  35. 35.61² =
  36. 36.29² =
  37. 37.29² =
  38. 38.31² =
  39. 39.51² =
  40. 40.49² =

Answer key

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

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