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Squares Trick Worksheet

Speed calculation lesson 10: Squares next to a ten · Set 671 · 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. 1.89² =
  2. 2.21² =
  3. 3.39² =
  4. 4.19² =
  5. 5.89² =
  6. 6.29² =
  7. 7.81² =
  8. 8.19² =
  9. 9.41² =
  10. 10.69² =
  11. 11.69² =
  12. 12.59² =
  13. 13.39² =
  14. 14.31² =
  15. 15.61² =
  16. 16.59² =
  17. 17.29² =
  18. 18.29² =
  19. 19.91² =
  20. 20.19² =
  21. 21.49² =
  22. 22.19² =
  23. 23.81² =
  24. 24.31² =
  25. 25.31² =
  26. 26.89² =
  27. 27.41² =
  28. 28.59² =
  29. 29.19² =
  30. 30.61² =
  31. 31.29² =
  32. 32.79² =
  33. 33.51² =
  34. 34.29² =
  35. 35.81² =
  36. 36.69² =
  37. 37.71² =
  38. 38.59² =
  39. 39.19² =
  40. 40.19² =

Answer key

  1. 7921
  2. 441
  3. 1521
  4. 361
  5. 7921
  6. 841
  7. 6561
  8. 361
  9. 1681
  10. 4761
  11. 4761
  12. 3481
  13. 1521
  14. 961
  15. 3721
  16. 3481
  17. 841
  18. 841
  19. 8281
  20. 361
  21. 2401
  22. 361
  23. 6561
  24. 961
  25. 961
  26. 7921
  27. 1681
  28. 3481
  29. 361
  30. 3721
  31. 841
  32. 6241
  33. 2601
  34. 841
  35. 6561
  36. 4761
  37. 5041
  38. 3481
  39. 361
  40. 361

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