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Squares Trick Worksheet

Speed calculation lesson 10: Squares next to a ten · Set 286 · 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. 2.59² =
  3. 3.59² =
  4. 4.91² =
  5. 5.29² =
  6. 6.61² =
  7. 7.51² =
  8. 8.31² =
  9. 9.41² =
  10. 10.29² =
  11. 11.81² =
  12. 12.89² =
  13. 13.89² =
  14. 14.31² =
  15. 15.31² =
  16. 16.59² =
  17. 17.21² =
  18. 18.71² =
  19. 19.29² =
  20. 20.41² =
  21. 21.59² =
  22. 22.39² =
  23. 23.51² =
  24. 24.31² =
  25. 25.91² =
  26. 26.19² =
  27. 27.19² =
  28. 28.79² =
  29. 29.39² =
  30. 30.21² =
  31. 31.61² =
  32. 32.41² =
  33. 33.51² =
  34. 34.59² =
  35. 35.31² =
  36. 36.69² =
  37. 37.19² =
  38. 38.81² =
  39. 39.29² =
  40. 40.31² =

Answer key

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

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