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Squares Trick Worksheet

Speed calculation lesson 10: Squares next to a ten · Set 12 · 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. 1.29² =
  2. 2.51² =
  3. 3.81² =
  4. 4.39² =
  5. 5.31² =
  6. 6.79² =
  7. 7.91² =
  8. 8.41² =
  9. 9.21² =
  10. 10.39² =
  11. 11.79² =
  12. 12.39² =
  13. 13.59² =
  14. 14.61² =
  15. 15.89² =
  16. 16.61² =
  17. 17.51² =
  18. 18.29² =
  19. 19.31² =
  20. 20.49² =
  21. 21.49² =
  22. 22.59² =
  23. 23.59² =
  24. 24.61² =
  25. 25.89² =
  26. 26.31² =
  27. 27.29² =
  28. 28.81² =
  29. 29.19² =
  30. 30.59² =
  31. 31.51² =
  32. 32.81² =
  33. 33.39² =
  34. 34.19² =
  35. 35.19² =
  36. 36.79² =
  37. 37.21² =
  38. 38.31² =
  39. 39.51² =
  40. 40.19² =

Answer key

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

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