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Squares Trick Worksheet

Speed calculation lesson 10: Squares next to a ten · Set 36 · 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. 1.19² =
  2. 2.39² =
  3. 3.69² =
  4. 4.21² =
  5. 5.79² =
  6. 6.79² =
  7. 7.29² =
  8. 8.19² =
  9. 9.29² =
  10. 10.19² =
  11. 11.61² =
  12. 12.21² =
  13. 13.89² =
  14. 14.81² =
  15. 15.51² =
  16. 16.39² =
  17. 17.89² =
  18. 18.31² =
  19. 19.91² =
  20. 20.61² =
  21. 21.19² =
  22. 22.91² =
  23. 23.39² =
  24. 24.21² =
  25. 25.69² =
  26. 26.29² =
  27. 27.79² =
  28. 28.21² =
  29. 29.61² =
  30. 30.21² =
  31. 31.91² =
  32. 32.31² =
  33. 33.39² =
  34. 34.31² =
  35. 35.41² =
  36. 36.81² =
  37. 37.69² =
  38. 38.51² =
  39. 39.31² =
  40. 40.39² =

Answer key

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

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