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Squares Trick Worksheet

Speed calculation lesson 10: Squares next to a ten · Set 404 · 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. 1.91² =
  2. 2.39² =
  3. 3.69² =
  4. 4.81² =
  5. 5.89² =
  6. 6.41² =
  7. 7.91² =
  8. 8.21² =
  9. 9.79² =
  10. 10.39² =
  11. 11.41² =
  12. 12.41² =
  13. 13.79² =
  14. 14.41² =
  15. 15.81² =
  16. 16.31² =
  17. 17.31² =
  18. 18.89² =
  19. 19.41² =
  20. 20.39² =
  21. 21.51² =
  22. 22.49² =
  23. 23.89² =
  24. 24.71² =
  25. 25.39² =
  26. 26.61² =
  27. 27.39² =
  28. 28.69² =
  29. 29.79² =
  30. 30.39² =
  31. 31.81² =
  32. 32.19² =
  33. 33.29² =
  34. 34.21² =
  35. 35.69² =
  36. 36.21² =
  37. 37.49² =
  38. 38.31² =
  39. 39.69² =
  40. 40.49² =

Answer key

  1. 8281
  2. 1521
  3. 4761
  4. 6561
  5. 7921
  6. 1681
  7. 8281
  8. 441
  9. 6241
  10. 1521
  11. 1681
  12. 1681
  13. 6241
  14. 1681
  15. 6561
  16. 961
  17. 961
  18. 7921
  19. 1681
  20. 1521
  21. 2601
  22. 2401
  23. 7921
  24. 5041
  25. 1521
  26. 3721
  27. 1521
  28. 4761
  29. 6241
  30. 1521
  31. 6561
  32. 361
  33. 841
  34. 441
  35. 4761
  36. 441
  37. 2401
  38. 961
  39. 4761
  40. 2401

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