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Squares Trick Worksheet

Speed calculation lesson 10: Squares next to a ten · Set 625 · 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. 2.89² =
  3. 3.79² =
  4. 4.89² =
  5. 5.29² =
  6. 6.71² =
  7. 7.31² =
  8. 8.39² =
  9. 9.89² =
  10. 10.79² =
  11. 11.49² =
  12. 12.31² =
  13. 13.19² =
  14. 14.41² =
  15. 15.19² =
  16. 16.49² =
  17. 17.29² =
  18. 18.29² =
  19. 19.69² =
  20. 20.59² =
  21. 21.71² =
  22. 22.69² =
  23. 23.41² =
  24. 24.41² =
  25. 25.79² =
  26. 26.19² =
  27. 27.81² =
  28. 28.69² =
  29. 29.79² =
  30. 30.91² =
  31. 31.81² =
  32. 32.81² =
  33. 33.19² =
  34. 34.31² =
  35. 35.81² =
  36. 36.29² =
  37. 37.19² =
  38. 38.41² =
  39. 39.51² =
  40. 40.51² =

Answer key

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

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