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Squares Trick Worksheet

Speed calculation lesson 10: Squares next to a ten · Set 833 · 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. 2.81² =
  3. 3.79² =
  4. 4.31² =
  5. 5.81² =
  6. 6.71² =
  7. 7.19² =
  8. 8.59² =
  9. 9.29² =
  10. 10.79² =
  11. 11.51² =
  12. 12.81² =
  13. 13.71² =
  14. 14.31² =
  15. 15.71² =
  16. 16.91² =
  17. 17.81² =
  18. 18.89² =
  19. 19.59² =
  20. 20.59² =
  21. 21.59² =
  22. 22.89² =
  23. 23.39² =
  24. 24.29² =
  25. 25.81² =
  26. 26.19² =
  27. 27.41² =
  28. 28.49² =
  29. 29.69² =
  30. 30.71² =
  31. 31.81² =
  32. 32.89² =
  33. 33.19² =
  34. 34.41² =
  35. 35.31² =
  36. 36.91² =
  37. 37.71² =
  38. 38.41² =
  39. 39.51² =
  40. 40.31² =

Answer key

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

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