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Squares Trick Worksheet

Speed calculation lesson 10: Squares next to a ten · Set 849 · 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. 1.79² =
  2. 2.21² =
  3. 3.59² =
  4. 4.39² =
  5. 5.81² =
  6. 6.71² =
  7. 7.71² =
  8. 8.59² =
  9. 9.49² =
  10. 10.89² =
  11. 11.69² =
  12. 12.59² =
  13. 13.69² =
  14. 14.89² =
  15. 15.89² =
  16. 16.41² =
  17. 17.21² =
  18. 18.19² =
  19. 19.29² =
  20. 20.51² =
  21. 21.51² =
  22. 22.49² =
  23. 23.21² =
  24. 24.89² =
  25. 25.49² =
  26. 26.79² =
  27. 27.31² =
  28. 28.69² =
  29. 29.89² =
  30. 30.31² =
  31. 31.69² =
  32. 32.29² =
  33. 33.91² =
  34. 34.69² =
  35. 35.41² =
  36. 36.49² =
  37. 37.21² =
  38. 38.41² =
  39. 39.19² =
  40. 40.39² =

Answer key

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

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