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Squares Trick Worksheet

Speed calculation lesson 10: Squares next to a ten · Set 555 · 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. 1.41² =
  2. 2.71² =
  3. 3.41² =
  4. 4.69² =
  5. 5.49² =
  6. 6.29² =
  7. 7.89² =
  8. 8.61² =
  9. 9.29² =
  10. 10.71² =
  11. 11.39² =
  12. 12.61² =
  13. 13.29² =
  14. 14.29² =
  15. 15.79² =
  16. 16.59² =
  17. 17.19² =
  18. 18.19² =
  19. 19.81² =
  20. 20.41² =
  21. 21.81² =
  22. 22.81² =
  23. 23.91² =
  24. 24.69² =
  25. 25.39² =
  26. 26.69² =
  27. 27.59² =
  28. 28.41² =
  29. 29.79² =
  30. 30.51² =
  31. 31.69² =
  32. 32.69² =
  33. 33.59² =
  34. 34.51² =
  35. 35.69² =
  36. 36.89² =
  37. 37.39² =
  38. 38.31² =
  39. 39.31² =
  40. 40.59² =

Answer key

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

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