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Squares Trick Worksheet

Speed calculation lesson 10: Squares next to a ten · Set 756 · 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. 1.51² =
  2. 2.51² =
  3. 3.19² =
  4. 4.59² =
  5. 5.91² =
  6. 6.61² =
  7. 7.89² =
  8. 8.89² =
  9. 9.49² =
  10. 10.91² =
  11. 11.19² =
  12. 12.49² =
  13. 13.51² =
  14. 14.31² =
  15. 15.89² =
  16. 16.59² =
  17. 17.19² =
  18. 18.69² =
  19. 19.69² =
  20. 20.39² =
  21. 21.21² =
  22. 22.71² =
  23. 23.71² =
  24. 24.41² =
  25. 25.49² =
  26. 26.31² =
  27. 27.69² =
  28. 28.31² =
  29. 29.61² =
  30. 30.89² =
  31. 31.41² =
  32. 32.69² =
  33. 33.91² =
  34. 34.59² =
  35. 35.41² =
  36. 36.31² =
  37. 37.29² =
  38. 38.19² =
  39. 39.49² =
  40. 40.91² =

Answer key

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

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