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Squares Trick Worksheet

Speed calculation lesson 10: Squares next to a ten · Set 683 · 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. 2.49² =
  3. 3.79² =
  4. 4.89² =
  5. 5.69² =
  6. 6.81² =
  7. 7.71² =
  8. 8.69² =
  9. 9.89² =
  10. 10.21² =
  11. 11.51² =
  12. 12.41² =
  13. 13.21² =
  14. 14.59² =
  15. 15.31² =
  16. 16.21² =
  17. 17.49² =
  18. 18.29² =
  19. 19.59² =
  20. 20.91² =
  21. 21.39² =
  22. 22.41² =
  23. 23.59² =
  24. 24.31² =
  25. 25.41² =
  26. 26.59² =
  27. 27.71² =
  28. 28.31² =
  29. 29.19² =
  30. 30.61² =
  31. 31.21² =
  32. 32.89² =
  33. 33.91² =
  34. 34.59² =
  35. 35.31² =
  36. 36.41² =
  37. 37.41² =
  38. 38.49² =
  39. 39.61² =
  40. 40.89² =

Answer key

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

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