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Squares Trick Worksheet

Speed calculation lesson 10: Squares next to a ten · Set 638 · 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. 1.71² =
  2. 2.89² =
  3. 3.41² =
  4. 4.59² =
  5. 5.31² =
  6. 6.89² =
  7. 7.29² =
  8. 8.51² =
  9. 9.29² =
  10. 10.31² =
  11. 11.31² =
  12. 12.31² =
  13. 13.19² =
  14. 14.91² =
  15. 15.49² =
  16. 16.79² =
  17. 17.21² =
  18. 18.51² =
  19. 19.19² =
  20. 20.71² =
  21. 21.69² =
  22. 22.19² =
  23. 23.59² =
  24. 24.79² =
  25. 25.29² =
  26. 26.81² =
  27. 27.79² =
  28. 28.89² =
  29. 29.19² =
  30. 30.29² =
  31. 31.69² =
  32. 32.51² =
  33. 33.39² =
  34. 34.89² =
  35. 35.51² =
  36. 36.19² =
  37. 37.91² =
  38. 38.81² =
  39. 39.29² =
  40. 40.29² =

Answer key

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

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