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Squares Trick Worksheet

Speed calculation lesson 10: Squares next to a ten · Set 733 · 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. 2.19² =
  3. 3.69² =
  4. 4.79² =
  5. 5.51² =
  6. 6.49² =
  7. 7.89² =
  8. 8.21² =
  9. 9.19² =
  10. 10.69² =
  11. 11.69² =
  12. 12.91² =
  13. 13.29² =
  14. 14.89² =
  15. 15.69² =
  16. 16.59² =
  17. 17.41² =
  18. 18.21² =
  19. 19.81² =
  20. 20.71² =
  21. 21.39² =
  22. 22.29² =
  23. 23.19² =
  24. 24.91² =
  25. 25.91² =
  26. 26.41² =
  27. 27.49² =
  28. 28.41² =
  29. 29.91² =
  30. 30.29² =
  31. 31.61² =
  32. 32.59² =
  33. 33.89² =
  34. 34.69² =
  35. 35.49² =
  36. 36.49² =
  37. 37.31² =
  38. 38.49² =
  39. 39.59² =
  40. 40.89² =

Answer key

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

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