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Squares Trick Worksheet

Speed calculation lesson 10: Squares next to a ten · Set 837 · 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. 1.19² =
  2. 2.39² =
  3. 3.81² =
  4. 4.29² =
  5. 5.49² =
  6. 6.49² =
  7. 7.71² =
  8. 8.41² =
  9. 9.29² =
  10. 10.31² =
  11. 11.81² =
  12. 12.19² =
  13. 13.31² =
  14. 14.41² =
  15. 15.49² =
  16. 16.41² =
  17. 17.39² =
  18. 18.39² =
  19. 19.39² =
  20. 20.89² =
  21. 21.21² =
  22. 22.19² =
  23. 23.89² =
  24. 24.61² =
  25. 25.39² =
  26. 26.61² =
  27. 27.49² =
  28. 28.41² =
  29. 29.91² =
  30. 30.41² =
  31. 31.39² =
  32. 32.59² =
  33. 33.19² =
  34. 34.79² =
  35. 35.59² =
  36. 36.19² =
  37. 37.41² =
  38. 38.89² =
  39. 39.41² =
  40. 40.69² =

Answer key

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

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