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Squares Trick Worksheet

Speed calculation lesson 10: Squares next to a ten · Set 750 · 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. 2.21² =
  3. 3.39² =
  4. 4.21² =
  5. 5.91² =
  6. 6.91² =
  7. 7.81² =
  8. 8.61² =
  9. 9.51² =
  10. 10.41² =
  11. 11.39² =
  12. 12.31² =
  13. 13.31² =
  14. 14.71² =
  15. 15.59² =
  16. 16.31² =
  17. 17.31² =
  18. 18.89² =
  19. 19.31² =
  20. 20.19² =
  21. 21.49² =
  22. 22.31² =
  23. 23.79² =
  24. 24.41² =
  25. 25.31² =
  26. 26.71² =
  27. 27.89² =
  28. 28.29² =
  29. 29.49² =
  30. 30.79² =
  31. 31.39² =
  32. 32.39² =
  33. 33.41² =
  34. 34.91² =
  35. 35.41² =
  36. 36.41² =
  37. 37.69² =
  38. 38.49² =
  39. 39.19² =
  40. 40.29² =

Answer key

  1. 2401
  2. 441
  3. 1521
  4. 441
  5. 8281
  6. 8281
  7. 6561
  8. 3721
  9. 2601
  10. 1681
  11. 1521
  12. 961
  13. 961
  14. 5041
  15. 3481
  16. 961
  17. 961
  18. 7921
  19. 961
  20. 361
  21. 2401
  22. 961
  23. 6241
  24. 1681
  25. 961
  26. 5041
  27. 7921
  28. 841
  29. 2401
  30. 6241
  31. 1521
  32. 1521
  33. 1681
  34. 8281
  35. 1681
  36. 1681
  37. 4761
  38. 2401
  39. 361
  40. 841

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