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Squares Trick Worksheet

Speed calculation lesson 10: Squares next to a ten · Set 9 · 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. 1.21² =
  2. 2.29² =
  3. 3.79² =
  4. 4.49² =
  5. 5.61² =
  6. 6.49² =
  7. 7.51² =
  8. 8.51² =
  9. 9.91² =
  10. 10.81² =
  11. 11.61² =
  12. 12.41² =
  13. 13.51² =
  14. 14.81² =
  15. 15.79² =
  16. 16.89² =
  17. 17.61² =
  18. 18.19² =
  19. 19.59² =
  20. 20.39² =
  21. 21.19² =
  22. 22.31² =
  23. 23.81² =
  24. 24.21² =
  25. 25.89² =
  26. 26.21² =
  27. 27.19² =
  28. 28.31² =
  29. 29.39² =
  30. 30.39² =
  31. 31.71² =
  32. 32.19² =
  33. 33.91² =
  34. 34.89² =
  35. 35.51² =
  36. 36.71² =
  37. 37.79² =
  38. 38.31² =
  39. 39.81² =
  40. 40.19² =

Answer key

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

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