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Squares Trick Worksheet

Speed calculation lesson 10: Squares next to a ten · Set 618 · 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. 1.49² =
  2. 2.19² =
  3. 3.21² =
  4. 4.49² =
  5. 5.21² =
  6. 6.91² =
  7. 7.41² =
  8. 8.89² =
  9. 9.69² =
  10. 10.61² =
  11. 11.91² =
  12. 12.69² =
  13. 13.21² =
  14. 14.31² =
  15. 15.41² =
  16. 16.61² =
  17. 17.21² =
  18. 18.69² =
  19. 19.81² =
  20. 20.59² =
  21. 21.51² =
  22. 22.31² =
  23. 23.89² =
  24. 24.39² =
  25. 25.51² =
  26. 26.79² =
  27. 27.79² =
  28. 28.79² =
  29. 29.49² =
  30. 30.79² =
  31. 31.21² =
  32. 32.31² =
  33. 33.51² =
  34. 34.59² =
  35. 35.39² =
  36. 36.81² =
  37. 37.41² =
  38. 38.61² =
  39. 39.49² =
  40. 40.59² =

Answer key

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

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