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Squares Trick Worksheet

Speed calculation lesson 10: Squares next to a ten · Set 363 · 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. 1.19² =
  2. 2.49² =
  3. 3.79² =
  4. 4.49² =
  5. 5.41² =
  6. 6.29² =
  7. 7.31² =
  8. 8.81² =
  9. 9.89² =
  10. 10.41² =
  11. 11.79² =
  12. 12.49² =
  13. 13.29² =
  14. 14.69² =
  15. 15.21² =
  16. 16.69² =
  17. 17.61² =
  18. 18.59² =
  19. 19.79² =
  20. 20.41² =
  21. 21.31² =
  22. 22.69² =
  23. 23.91² =
  24. 24.31² =
  25. 25.69² =
  26. 26.21² =
  27. 27.61² =
  28. 28.21² =
  29. 29.21² =
  30. 30.51² =
  31. 31.49² =
  32. 32.91² =
  33. 33.91² =
  34. 34.91² =
  35. 35.41² =
  36. 36.31² =
  37. 37.31² =
  38. 38.91² =
  39. 39.49² =
  40. 40.69² =

Answer key

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

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