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Squares Trick Worksheet

Speed calculation lesson 10: Squares next to a ten · Set 485 · 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. 1.41² =
  2. 2.91² =
  3. 3.51² =
  4. 4.19² =
  5. 5.89² =
  6. 6.89² =
  7. 7.19² =
  8. 8.31² =
  9. 9.39² =
  10. 10.21² =
  11. 11.69² =
  12. 12.31² =
  13. 13.61² =
  14. 14.61² =
  15. 15.59² =
  16. 16.91² =
  17. 17.61² =
  18. 18.79² =
  19. 19.19² =
  20. 20.41² =
  21. 21.61² =
  22. 22.69² =
  23. 23.21² =
  24. 24.59² =
  25. 25.51² =
  26. 26.89² =
  27. 27.89² =
  28. 28.21² =
  29. 29.19² =
  30. 30.91² =
  31. 31.51² =
  32. 32.61² =
  33. 33.69² =
  34. 34.89² =
  35. 35.69² =
  36. 36.19² =
  37. 37.19² =
  38. 38.59² =
  39. 39.79² =
  40. 40.61² =

Answer key

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

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