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Squares Trick Worksheet

Speed calculation lesson 10: Squares next to a ten · Set 270 · 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. 2.91² =
  3. 3.51² =
  4. 4.69² =
  5. 5.29² =
  6. 6.69² =
  7. 7.21² =
  8. 8.41² =
  9. 9.39² =
  10. 10.19² =
  11. 11.29² =
  12. 12.31² =
  13. 13.21² =
  14. 14.39² =
  15. 15.49² =
  16. 16.51² =
  17. 17.51² =
  18. 18.19² =
  19. 19.49² =
  20. 20.21² =
  21. 21.79² =
  22. 22.31² =
  23. 23.59² =
  24. 24.29² =
  25. 25.19² =
  26. 26.51² =
  27. 27.29² =
  28. 28.31² =
  29. 29.49² =
  30. 30.61² =
  31. 31.41² =
  32. 32.59² =
  33. 33.41² =
  34. 34.91² =
  35. 35.69² =
  36. 36.41² =
  37. 37.31² =
  38. 38.49² =
  39. 39.19² =
  40. 40.41² =

Answer key

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

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