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Squares Trick Worksheet

Speed calculation lesson 10: Squares next to a ten · Set 244 · 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. 1.89² =
  2. 2.31² =
  3. 3.21² =
  4. 4.81² =
  5. 5.39² =
  6. 6.29² =
  7. 7.69² =
  8. 8.59² =
  9. 9.19² =
  10. 10.81² =
  11. 11.91² =
  12. 12.79² =
  13. 13.61² =
  14. 14.31² =
  15. 15.49² =
  16. 16.79² =
  17. 17.49² =
  18. 18.21² =
  19. 19.19² =
  20. 20.21² =
  21. 21.59² =
  22. 22.81² =
  23. 23.41² =
  24. 24.79² =
  25. 25.41² =
  26. 26.61² =
  27. 27.19² =
  28. 28.29² =
  29. 29.19² =
  30. 30.49² =
  31. 31.31² =
  32. 32.19² =
  33. 33.61² =
  34. 34.49² =
  35. 35.39² =
  36. 36.61² =
  37. 37.39² =
  38. 38.21² =
  39. 39.81² =
  40. 40.31² =

Answer key

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

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