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Squares Trick Worksheet

Speed calculation lesson 10: Squares next to a ten · Set 642 · 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. 1.19² =
  2. 2.71² =
  3. 3.31² =
  4. 4.49² =
  5. 5.79² =
  6. 6.89² =
  7. 7.29² =
  8. 8.59² =
  9. 9.41² =
  10. 10.21² =
  11. 11.29² =
  12. 12.29² =
  13. 13.39² =
  14. 14.39² =
  15. 15.79² =
  16. 16.21² =
  17. 17.89² =
  18. 18.39² =
  19. 19.71² =
  20. 20.49² =
  21. 21.19² =
  22. 22.81² =
  23. 23.39² =
  24. 24.21² =
  25. 25.71² =
  26. 26.91² =
  27. 27.71² =
  28. 28.89² =
  29. 29.19² =
  30. 30.21² =
  31. 31.59² =
  32. 32.21² =
  33. 33.59² =
  34. 34.51² =
  35. 35.51² =
  36. 36.19² =
  37. 37.79² =
  38. 38.31² =
  39. 39.71² =
  40. 40.89² =

Answer key

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

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