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Squares Trick Worksheet

Speed calculation lesson 10: Squares next to a ten · Set 294 · 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. 1.49² =
  2. 2.31² =
  3. 3.31² =
  4. 4.39² =
  5. 5.81² =
  6. 6.21² =
  7. 7.31² =
  8. 8.89² =
  9. 9.59² =
  10. 10.81² =
  11. 11.39² =
  12. 12.41² =
  13. 13.19² =
  14. 14.41² =
  15. 15.19² =
  16. 16.21² =
  17. 17.81² =
  18. 18.91² =
  19. 19.21² =
  20. 20.21² =
  21. 21.21² =
  22. 22.21² =
  23. 23.91² =
  24. 24.39² =
  25. 25.19² =
  26. 26.59² =
  27. 27.31² =
  28. 28.21² =
  29. 29.71² =
  30. 30.31² =
  31. 31.51² =
  32. 32.69² =
  33. 33.61² =
  34. 34.59² =
  35. 35.41² =
  36. 36.39² =
  37. 37.89² =
  38. 38.89² =
  39. 39.81² =
  40. 40.79² =

Answer key

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

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