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Squares Trick Worksheet

Speed calculation lesson 10: Squares next to a ten · Set 605 · 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. 1.61² =
  2. 2.39² =
  3. 3.19² =
  4. 4.41² =
  5. 5.19² =
  6. 6.39² =
  7. 7.69² =
  8. 8.21² =
  9. 9.69² =
  10. 10.19² =
  11. 11.21² =
  12. 12.49² =
  13. 13.31² =
  14. 14.41² =
  15. 15.51² =
  16. 16.71² =
  17. 17.71² =
  18. 18.41² =
  19. 19.71² =
  20. 20.61² =
  21. 21.89² =
  22. 22.29² =
  23. 23.69² =
  24. 24.71² =
  25. 25.31² =
  26. 26.81² =
  27. 27.79² =
  28. 28.81² =
  29. 29.19² =
  30. 30.39² =
  31. 31.89² =
  32. 32.59² =
  33. 33.41² =
  34. 34.51² =
  35. 35.19² =
  36. 36.31² =
  37. 37.51² =
  38. 38.69² =
  39. 39.29² =
  40. 40.21² =

Answer key

  1. 3721
  2. 1521
  3. 361
  4. 1681
  5. 361
  6. 1521
  7. 4761
  8. 441
  9. 4761
  10. 361
  11. 441
  12. 2401
  13. 961
  14. 1681
  15. 2601
  16. 5041
  17. 5041
  18. 1681
  19. 5041
  20. 3721
  21. 7921
  22. 841
  23. 4761
  24. 5041
  25. 961
  26. 6561
  27. 6241
  28. 6561
  29. 361
  30. 1521
  31. 7921
  32. 3481
  33. 1681
  34. 2601
  35. 361
  36. 961
  37. 2601
  38. 4761
  39. 841
  40. 441

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