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Squares Trick Worksheet

Speed calculation lesson 10: Squares next to a ten · Set 564 · 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. 1.41² =
  2. 2.39² =
  3. 3.21² =
  4. 4.31² =
  5. 5.81² =
  6. 6.39² =
  7. 7.61² =
  8. 8.19² =
  9. 9.21² =
  10. 10.79² =
  11. 11.91² =
  12. 12.29² =
  13. 13.61² =
  14. 14.59² =
  15. 15.21² =
  16. 16.79² =
  17. 17.89² =
  18. 18.21² =
  19. 19.79² =
  20. 20.21² =
  21. 21.69² =
  22. 22.41² =
  23. 23.89² =
  24. 24.29² =
  25. 25.61² =
  26. 26.89² =
  27. 27.79² =
  28. 28.31² =
  29. 29.89² =
  30. 30.89² =
  31. 31.79² =
  32. 32.91² =
  33. 33.81² =
  34. 34.21² =
  35. 35.21² =
  36. 36.79² =
  37. 37.59² =
  38. 38.19² =
  39. 39.21² =
  40. 40.29² =

Answer key

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

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