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Squares Trick Worksheet

Speed calculation lesson 10: Squares next to a ten · Set 146 · 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. 1.31² =
  2. 2.91² =
  3. 3.81² =
  4. 4.91² =
  5. 5.29² =
  6. 6.91² =
  7. 7.31² =
  8. 8.89² =
  9. 9.19² =
  10. 10.89² =
  11. 11.71² =
  12. 12.69² =
  13. 13.79² =
  14. 14.29² =
  15. 15.21² =
  16. 16.41² =
  17. 17.69² =
  18. 18.21² =
  19. 19.61² =
  20. 20.61² =
  21. 21.41² =
  22. 22.89² =
  23. 23.81² =
  24. 24.59² =
  25. 25.89² =
  26. 26.51² =
  27. 27.39² =
  28. 28.71² =
  29. 29.41² =
  30. 30.21² =
  31. 31.51² =
  32. 32.39² =
  33. 33.31² =
  34. 34.39² =
  35. 35.21² =
  36. 36.19² =
  37. 37.71² =
  38. 38.49² =
  39. 39.21² =
  40. 40.69² =

Answer key

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

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