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Squares Trick Worksheet

Speed calculation lesson 10: Squares next to a ten · Set 541 · 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. 1.51² =
  2. 2.69² =
  3. 3.49² =
  4. 4.31² =
  5. 5.19² =
  6. 6.19² =
  7. 7.59² =
  8. 8.29² =
  9. 9.29² =
  10. 10.21² =
  11. 11.41² =
  12. 12.29² =
  13. 13.39² =
  14. 14.49² =
  15. 15.59² =
  16. 16.21² =
  17. 17.89² =
  18. 18.31² =
  19. 19.41² =
  20. 20.39² =
  21. 21.91² =
  22. 22.61² =
  23. 23.39² =
  24. 24.19² =
  25. 25.21² =
  26. 26.39² =
  27. 27.89² =
  28. 28.31² =
  29. 29.41² =
  30. 30.91² =
  31. 31.29² =
  32. 32.39² =
  33. 33.49² =
  34. 34.41² =
  35. 35.41² =
  36. 36.91² =
  37. 37.19² =
  38. 38.39² =
  39. 39.89² =
  40. 40.79² =

Answer key

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

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