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Squares Trick Worksheet

Speed calculation lesson 10: Squares next to a ten · Set 499 · 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. 1.89² =
  2. 2.81² =
  3. 3.19² =
  4. 4.19² =
  5. 5.41² =
  6. 6.39² =
  7. 7.69² =
  8. 8.79² =
  9. 9.29² =
  10. 10.39² =
  11. 11.21² =
  12. 12.41² =
  13. 13.29² =
  14. 14.21² =
  15. 15.51² =
  16. 16.91² =
  17. 17.51² =
  18. 18.29² =
  19. 19.39² =
  20. 20.19² =
  21. 21.19² =
  22. 22.61² =
  23. 23.91² =
  24. 24.91² =
  25. 25.69² =
  26. 26.29² =
  27. 27.29² =
  28. 28.31² =
  29. 29.41² =
  30. 30.21² =
  31. 31.39² =
  32. 32.51² =
  33. 33.31² =
  34. 34.79² =
  35. 35.79² =
  36. 36.31² =
  37. 37.71² =
  38. 38.59² =
  39. 39.71² =
  40. 40.81² =

Answer key

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

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