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Squares Trick Worksheet

Speed calculation lesson 10: Squares next to a ten · Set 761 · 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. 1.49² =
  2. 2.89² =
  3. 3.19² =
  4. 4.19² =
  5. 5.81² =
  6. 6.51² =
  7. 7.91² =
  8. 8.31² =
  9. 9.81² =
  10. 10.91² =
  11. 11.19² =
  12. 12.31² =
  13. 13.21² =
  14. 14.29² =
  15. 15.89² =
  16. 16.21² =
  17. 17.51² =
  18. 18.81² =
  19. 19.41² =
  20. 20.21² =
  21. 21.19² =
  22. 22.69² =
  23. 23.69² =
  24. 24.81² =
  25. 25.51² =
  26. 26.79² =
  27. 27.19² =
  28. 28.81² =
  29. 29.79² =
  30. 30.21² =
  31. 31.69² =
  32. 32.61² =
  33. 33.19² =
  34. 34.59² =
  35. 35.41² =
  36. 36.49² =
  37. 37.19² =
  38. 38.59² =
  39. 39.31² =
  40. 40.59² =

Answer key

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

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