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Squares Trick Worksheet

Speed calculation lesson 10: Squares next to a ten · Set 796 · 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. 2.61² =
  3. 3.19² =
  4. 4.61² =
  5. 5.79² =
  6. 6.69² =
  7. 7.19² =
  8. 8.29² =
  9. 9.41² =
  10. 10.71² =
  11. 11.31² =
  12. 12.89² =
  13. 13.81² =
  14. 14.89² =
  15. 15.21² =
  16. 16.31² =
  17. 17.19² =
  18. 18.19² =
  19. 19.21² =
  20. 20.89² =
  21. 21.19² =
  22. 22.59² =
  23. 23.59² =
  24. 24.61² =
  25. 25.79² =
  26. 26.49² =
  27. 27.41² =
  28. 28.31² =
  29. 29.51² =
  30. 30.51² =
  31. 31.91² =
  32. 32.41² =
  33. 33.49² =
  34. 34.49² =
  35. 35.71² =
  36. 36.59² =
  37. 37.49² =
  38. 38.31² =
  39. 39.19² =
  40. 40.61² =

Answer key

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

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