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Squares Trick Worksheet

Speed calculation lesson 10: Squares next to a ten · Set 790 · 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. 1.61² =
  2. 2.61² =
  3. 3.49² =
  4. 4.39² =
  5. 5.61² =
  6. 6.91² =
  7. 7.31² =
  8. 8.41² =
  9. 9.49² =
  10. 10.89² =
  11. 11.61² =
  12. 12.81² =
  13. 13.51² =
  14. 14.19² =
  15. 15.69² =
  16. 16.31² =
  17. 17.59² =
  18. 18.81² =
  19. 19.81² =
  20. 20.49² =
  21. 21.81² =
  22. 22.79² =
  23. 23.41² =
  24. 24.89² =
  25. 25.31² =
  26. 26.29² =
  27. 27.79² =
  28. 28.91² =
  29. 29.31² =
  30. 30.31² =
  31. 31.91² =
  32. 32.89² =
  33. 33.41² =
  34. 34.81² =
  35. 35.89² =
  36. 36.29² =
  37. 37.29² =
  38. 38.21² =
  39. 39.29² =
  40. 40.71² =

Answer key

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

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