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Squares Trick Worksheet

Speed calculation lesson 10: Squares next to a ten · Set 540 · 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. 2.21² =
  3. 3.79² =
  4. 4.71² =
  5. 5.49² =
  6. 6.31² =
  7. 7.81² =
  8. 8.81² =
  9. 9.59² =
  10. 10.41² =
  11. 11.81² =
  12. 12.19² =
  13. 13.81² =
  14. 14.61² =
  15. 15.21² =
  16. 16.39² =
  17. 17.51² =
  18. 18.81² =
  19. 19.71² =
  20. 20.31² =
  21. 21.51² =
  22. 22.41² =
  23. 23.31² =
  24. 24.59² =
  25. 25.71² =
  26. 26.21² =
  27. 27.69² =
  28. 28.41² =
  29. 29.91² =
  30. 30.61² =
  31. 31.29² =
  32. 32.49² =
  33. 33.31² =
  34. 34.51² =
  35. 35.89² =
  36. 36.49² =
  37. 37.49² =
  38. 38.49² =
  39. 39.31² =
  40. 40.69² =

Answer key

  1. 1681
  2. 441
  3. 6241
  4. 5041
  5. 2401
  6. 961
  7. 6561
  8. 6561
  9. 3481
  10. 1681
  11. 6561
  12. 361
  13. 6561
  14. 3721
  15. 441
  16. 1521
  17. 2601
  18. 6561
  19. 5041
  20. 961
  21. 2601
  22. 1681
  23. 961
  24. 3481
  25. 5041
  26. 441
  27. 4761
  28. 1681
  29. 8281
  30. 3721
  31. 841
  32. 2401
  33. 961
  34. 2601
  35. 7921
  36. 2401
  37. 2401
  38. 2401
  39. 961
  40. 4761

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