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Squares Trick Worksheet

Speed calculation lesson 10: Squares next to a ten · Set 262 · 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. 1.71² =
  2. 2.81² =
  3. 3.19² =
  4. 4.39² =
  5. 5.91² =
  6. 6.71² =
  7. 7.51² =
  8. 8.69² =
  9. 9.91² =
  10. 10.51² =
  11. 11.21² =
  12. 12.91² =
  13. 13.41² =
  14. 14.39² =
  15. 15.19² =
  16. 16.19² =
  17. 17.91² =
  18. 18.29² =
  19. 19.29² =
  20. 20.29² =
  21. 21.31² =
  22. 22.39² =
  23. 23.29² =
  24. 24.51² =
  25. 25.59² =
  26. 26.31² =
  27. 27.19² =
  28. 28.59² =
  29. 29.29² =
  30. 30.81² =
  31. 31.61² =
  32. 32.21² =
  33. 33.71² =
  34. 34.21² =
  35. 35.59² =
  36. 36.31² =
  37. 37.39² =
  38. 38.41² =
  39. 39.39² =
  40. 40.91² =

Answer key

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

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