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Squares Trick Worksheet

Speed calculation lesson 10: Squares next to a ten · Set 310 · 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. 2.71² =
  3. 3.81² =
  4. 4.19² =
  5. 5.81² =
  6. 6.49² =
  7. 7.29² =
  8. 8.71² =
  9. 9.71² =
  10. 10.71² =
  11. 11.71² =
  12. 12.79² =
  13. 13.89² =
  14. 14.71² =
  15. 15.39² =
  16. 16.69² =
  17. 17.51² =
  18. 18.21² =
  19. 19.41² =
  20. 20.31² =
  21. 21.31² =
  22. 22.41² =
  23. 23.19² =
  24. 24.41² =
  25. 25.21² =
  26. 26.39² =
  27. 27.19² =
  28. 28.41² =
  29. 29.89² =
  30. 30.29² =
  31. 31.29² =
  32. 32.19² =
  33. 33.41² =
  34. 34.51² =
  35. 35.19² =
  36. 36.59² =
  37. 37.51² =
  38. 38.61² =
  39. 39.51² =
  40. 40.89² =

Answer key

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

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