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Squares Trick Worksheet

Speed calculation lesson 10: Squares next to a ten · Set 653 · 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. 1.81² =
  2. 2.91² =
  3. 3.81² =
  4. 4.91² =
  5. 5.29² =
  6. 6.91² =
  7. 7.89² =
  8. 8.59² =
  9. 9.41² =
  10. 10.51² =
  11. 11.49² =
  12. 12.69² =
  13. 13.71² =
  14. 14.69² =
  15. 15.29² =
  16. 16.39² =
  17. 17.29² =
  18. 18.69² =
  19. 19.29² =
  20. 20.79² =
  21. 21.69² =
  22. 22.69² =
  23. 23.89² =
  24. 24.31² =
  25. 25.81² =
  26. 26.51² =
  27. 27.71² =
  28. 28.91² =
  29. 29.21² =
  30. 30.91² =
  31. 31.31² =
  32. 32.89² =
  33. 33.21² =
  34. 34.49² =
  35. 35.39² =
  36. 36.59² =
  37. 37.21² =
  38. 38.49² =
  39. 39.79² =
  40. 40.21² =

Answer key

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

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