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Squares Trick Worksheet

Speed calculation lesson 10: Squares next to a ten · Set 521 · 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. 1.79² =
  2. 2.19² =
  3. 3.29² =
  4. 4.91² =
  5. 5.41² =
  6. 6.69² =
  7. 7.81² =
  8. 8.51² =
  9. 9.69² =
  10. 10.31² =
  11. 11.29² =
  12. 12.31² =
  13. 13.91² =
  14. 14.71² =
  15. 15.59² =
  16. 16.59² =
  17. 17.71² =
  18. 18.29² =
  19. 19.41² =
  20. 20.89² =
  21. 21.49² =
  22. 22.61² =
  23. 23.39² =
  24. 24.51² =
  25. 25.29² =
  26. 26.39² =
  27. 27.19² =
  28. 28.69² =
  29. 29.29² =
  30. 30.31² =
  31. 31.69² =
  32. 32.51² =
  33. 33.59² =
  34. 34.29² =
  35. 35.31² =
  36. 36.59² =
  37. 37.59² =
  38. 38.41² =
  39. 39.59² =
  40. 40.29² =

Answer key

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

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