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Squares Trick Worksheet

Speed calculation lesson 10: Squares next to a ten · Set 793 · 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. 1.49² =
  2. 2.49² =
  3. 3.29² =
  4. 4.71² =
  5. 5.39² =
  6. 6.31² =
  7. 7.29² =
  8. 8.29² =
  9. 9.71² =
  10. 10.31² =
  11. 11.81² =
  12. 12.59² =
  13. 13.49² =
  14. 14.61² =
  15. 15.69² =
  16. 16.61² =
  17. 17.21² =
  18. 18.31² =
  19. 19.61² =
  20. 20.61² =
  21. 21.69² =
  22. 22.71² =
  23. 23.61² =
  24. 24.19² =
  25. 25.91² =
  26. 26.71² =
  27. 27.69² =
  28. 28.39² =
  29. 29.91² =
  30. 30.71² =
  31. 31.71² =
  32. 32.29² =
  33. 33.21² =
  34. 34.51² =
  35. 35.39² =
  36. 36.51² =
  37. 37.39² =
  38. 38.51² =
  39. 39.81² =
  40. 40.41² =

Answer key

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

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