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Squares Trick Worksheet

Speed calculation lesson 10: Squares next to a ten · Set 568 · 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. 1.81² =
  2. 2.69² =
  3. 3.61² =
  4. 4.89² =
  5. 5.59² =
  6. 6.59² =
  7. 7.71² =
  8. 8.79² =
  9. 9.71² =
  10. 10.69² =
  11. 11.29² =
  12. 12.31² =
  13. 13.51² =
  14. 14.41² =
  15. 15.69² =
  16. 16.29² =
  17. 17.69² =
  18. 18.21² =
  19. 19.19² =
  20. 20.69² =
  21. 21.49² =
  22. 22.71² =
  23. 23.79² =
  24. 24.89² =
  25. 25.29² =
  26. 26.41² =
  27. 27.39² =
  28. 28.51² =
  29. 29.21² =
  30. 30.91² =
  31. 31.39² =
  32. 32.31² =
  33. 33.51² =
  34. 34.79² =
  35. 35.49² =
  36. 36.39² =
  37. 37.19² =
  38. 38.71² =
  39. 39.41² =
  40. 40.59² =

Answer key

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

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