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Squares Trick Worksheet

Speed calculation lesson 10: Squares next to a ten · Set 471 · 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. 1.39² =
  2. 2.19² =
  3. 3.61² =
  4. 4.51² =
  5. 5.81² =
  6. 6.29² =
  7. 7.21² =
  8. 8.29² =
  9. 9.21² =
  10. 10.81² =
  11. 11.21² =
  12. 12.29² =
  13. 13.31² =
  14. 14.21² =
  15. 15.71² =
  16. 16.71² =
  17. 17.19² =
  18. 18.59² =
  19. 19.91² =
  20. 20.19² =
  21. 21.81² =
  22. 22.19² =
  23. 23.31² =
  24. 24.21² =
  25. 25.51² =
  26. 26.61² =
  27. 27.39² =
  28. 28.79² =
  29. 29.29² =
  30. 30.81² =
  31. 31.71² =
  32. 32.79² =
  33. 33.41² =
  34. 34.31² =
  35. 35.29² =
  36. 36.41² =
  37. 37.81² =
  38. 38.69² =
  39. 39.19² =
  40. 40.59² =

Answer key

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

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