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Squares Trick Worksheet

Speed calculation lesson 10: Squares next to a ten · Set 462 · 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. 2.29² =
  3. 3.21² =
  4. 4.51² =
  5. 5.51² =
  6. 6.81² =
  7. 7.41² =
  8. 8.41² =
  9. 9.41² =
  10. 10.41² =
  11. 11.31² =
  12. 12.31² =
  13. 13.19² =
  14. 14.71² =
  15. 15.49² =
  16. 16.79² =
  17. 17.39² =
  18. 18.29² =
  19. 19.61² =
  20. 20.21² =
  21. 21.31² =
  22. 22.29² =
  23. 23.61² =
  24. 24.49² =
  25. 25.39² =
  26. 26.31² =
  27. 27.89² =
  28. 28.29² =
  29. 29.89² =
  30. 30.21² =
  31. 31.69² =
  32. 32.69² =
  33. 33.69² =
  34. 34.81² =
  35. 35.31² =
  36. 36.29² =
  37. 37.49² =
  38. 38.49² =
  39. 39.19² =
  40. 40.31² =

Answer key

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

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