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Squares Trick Worksheet

Speed calculation lesson 10: Squares next to a ten · Set 168 · 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. 2.29² =
  3. 3.21² =
  4. 4.71² =
  5. 5.21² =
  6. 6.21² =
  7. 7.31² =
  8. 8.39² =
  9. 9.41² =
  10. 10.29² =
  11. 11.71² =
  12. 12.91² =
  13. 13.29² =
  14. 14.79² =
  15. 15.81² =
  16. 16.59² =
  17. 17.71² =
  18. 18.69² =
  19. 19.19² =
  20. 20.21² =
  21. 21.69² =
  22. 22.61² =
  23. 23.89² =
  24. 24.21² =
  25. 25.61² =
  26. 26.31² =
  27. 27.91² =
  28. 28.79² =
  29. 29.31² =
  30. 30.31² =
  31. 31.19² =
  32. 32.39² =
  33. 33.59² =
  34. 34.19² =
  35. 35.51² =
  36. 36.59² =
  37. 37.49² =
  38. 38.31² =
  39. 39.21² =
  40. 40.81² =

Answer key

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

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