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Squares Trick Worksheet

Speed calculation lesson 10: Squares next to a ten · Set 641 · 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. 1.59² =
  2. 2.59² =
  3. 3.29² =
  4. 4.39² =
  5. 5.19² =
  6. 6.49² =
  7. 7.21² =
  8. 8.51² =
  9. 9.91² =
  10. 10.71² =
  11. 11.71² =
  12. 12.31² =
  13. 13.61² =
  14. 14.41² =
  15. 15.21² =
  16. 16.31² =
  17. 17.59² =
  18. 18.89² =
  19. 19.41² =
  20. 20.51² =
  21. 21.61² =
  22. 22.59² =
  23. 23.19² =
  24. 24.41² =
  25. 25.91² =
  26. 26.71² =
  27. 27.29² =
  28. 28.81² =
  29. 29.69² =
  30. 30.41² =
  31. 31.29² =
  32. 32.21² =
  33. 33.69² =
  34. 34.81² =
  35. 35.29² =
  36. 36.49² =
  37. 37.69² =
  38. 38.59² =
  39. 39.19² =
  40. 40.69² =

Answer key

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

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