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Squares Trick Worksheet

Speed calculation lesson 10: Squares next to a ten · Set 246 · 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. 1.91² =
  2. 2.69² =
  3. 3.31² =
  4. 4.31² =
  5. 5.39² =
  6. 6.31² =
  7. 7.59² =
  8. 8.59² =
  9. 9.19² =
  10. 10.49² =
  11. 11.41² =
  12. 12.91² =
  13. 13.69² =
  14. 14.51² =
  15. 15.29² =
  16. 16.39² =
  17. 17.79² =
  18. 18.31² =
  19. 19.49² =
  20. 20.71² =
  21. 21.19² =
  22. 22.31² =
  23. 23.39² =
  24. 24.59² =
  25. 25.59² =
  26. 26.51² =
  27. 27.21² =
  28. 28.69² =
  29. 29.69² =
  30. 30.49² =
  31. 31.81² =
  32. 32.59² =
  33. 33.69² =
  34. 34.71² =
  35. 35.59² =
  36. 36.59² =
  37. 37.69² =
  38. 38.51² =
  39. 39.31² =
  40. 40.69² =

Answer key

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

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