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Squares Trick Worksheet

Speed calculation lesson 10: Squares next to a ten · Set 337 · 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. 1.41² =
  2. 2.19² =
  3. 3.59² =
  4. 4.61² =
  5. 5.29² =
  6. 6.39² =
  7. 7.59² =
  8. 8.51² =
  9. 9.79² =
  10. 10.39² =
  11. 11.41² =
  12. 12.59² =
  13. 13.39² =
  14. 14.29² =
  15. 15.19² =
  16. 16.29² =
  17. 17.21² =
  18. 18.29² =
  19. 19.49² =
  20. 20.51² =
  21. 21.79² =
  22. 22.69² =
  23. 23.91² =
  24. 24.91² =
  25. 25.49² =
  26. 26.31² =
  27. 27.29² =
  28. 28.31² =
  29. 29.69² =
  30. 30.59² =
  31. 31.79² =
  32. 32.19² =
  33. 33.59² =
  34. 34.69² =
  35. 35.89² =
  36. 36.31² =
  37. 37.21² =
  38. 38.31² =
  39. 39.31² =
  40. 40.91² =

Answer key

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

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