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Squares Trick Worksheet

Speed calculation lesson 10: Squares next to a ten · Set 872 · 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. 1.39² =
  2. 2.89² =
  3. 3.91² =
  4. 4.71² =
  5. 5.61² =
  6. 6.29² =
  7. 7.91² =
  8. 8.69² =
  9. 9.51² =
  10. 10.21² =
  11. 11.79² =
  12. 12.51² =
  13. 13.21² =
  14. 14.41² =
  15. 15.91² =
  16. 16.71² =
  17. 17.81² =
  18. 18.71² =
  19. 19.79² =
  20. 20.39² =
  21. 21.79² =
  22. 22.21² =
  23. 23.21² =
  24. 24.39² =
  25. 25.29² =
  26. 26.19² =
  27. 27.31² =
  28. 28.59² =
  29. 29.49² =
  30. 30.91² =
  31. 31.89² =
  32. 32.41² =
  33. 33.81² =
  34. 34.79² =
  35. 35.31² =
  36. 36.19² =
  37. 37.81² =
  38. 38.41² =
  39. 39.41² =
  40. 40.31² =

Answer key

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

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