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Squares Trick Worksheet

Speed calculation lesson 10: Squares next to a ten · Set 377 · 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. 2.61² =
  3. 3.21² =
  4. 4.81² =
  5. 5.19² =
  6. 6.69² =
  7. 7.81² =
  8. 8.69² =
  9. 9.19² =
  10. 10.29² =
  11. 11.29² =
  12. 12.69² =
  13. 13.61² =
  14. 14.79² =
  15. 15.51² =
  16. 16.61² =
  17. 17.59² =
  18. 18.81² =
  19. 19.29² =
  20. 20.21² =
  21. 21.21² =
  22. 22.59² =
  23. 23.39² =
  24. 24.49² =
  25. 25.81² =
  26. 26.39² =
  27. 27.51² =
  28. 28.91² =
  29. 29.81² =
  30. 30.79² =
  31. 31.79² =
  32. 32.49² =
  33. 33.69² =
  34. 34.21² =
  35. 35.49² =
  36. 36.31² =
  37. 37.91² =
  38. 38.41² =
  39. 39.69² =
  40. 40.29² =

Answer key

  1. 7921
  2. 3721
  3. 441
  4. 6561
  5. 361
  6. 4761
  7. 6561
  8. 4761
  9. 361
  10. 841
  11. 841
  12. 4761
  13. 3721
  14. 6241
  15. 2601
  16. 3721
  17. 3481
  18. 6561
  19. 841
  20. 441
  21. 441
  22. 3481
  23. 1521
  24. 2401
  25. 6561
  26. 1521
  27. 2601
  28. 8281
  29. 6561
  30. 6241
  31. 6241
  32. 2401
  33. 4761
  34. 441
  35. 2401
  36. 961
  37. 8281
  38. 1681
  39. 4761
  40. 841

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