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Squares Trick Worksheet

Speed calculation lesson 10: Squares next to a ten · Set 230 · 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. 1.69² =
  2. 2.31² =
  3. 3.39² =
  4. 4.91² =
  5. 5.71² =
  6. 6.91² =
  7. 7.81² =
  8. 8.91² =
  9. 9.21² =
  10. 10.89² =
  11. 11.59² =
  12. 12.31² =
  13. 13.89² =
  14. 14.51² =
  15. 15.49² =
  16. 16.69² =
  17. 17.39² =
  18. 18.59² =
  19. 19.79² =
  20. 20.71² =
  21. 21.81² =
  22. 22.89² =
  23. 23.39² =
  24. 24.89² =
  25. 25.61² =
  26. 26.31² =
  27. 27.19² =
  28. 28.81² =
  29. 29.51² =
  30. 30.71² =
  31. 31.41² =
  32. 32.41² =
  33. 33.29² =
  34. 34.59² =
  35. 35.41² =
  36. 36.21² =
  37. 37.51² =
  38. 38.21² =
  39. 39.69² =
  40. 40.41² =

Answer key

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

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