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Squares Trick Worksheet

Speed calculation lesson 10: Squares next to a ten · Set 311 · 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. 2.19² =
  3. 3.59² =
  4. 4.79² =
  5. 5.19² =
  6. 6.69² =
  7. 7.71² =
  8. 8.69² =
  9. 9.41² =
  10. 10.51² =
  11. 11.49² =
  12. 12.19² =
  13. 13.91² =
  14. 14.81² =
  15. 15.49² =
  16. 16.39² =
  17. 17.39² =
  18. 18.89² =
  19. 19.31² =
  20. 20.31² =
  21. 21.21² =
  22. 22.81² =
  23. 23.41² =
  24. 24.19² =
  25. 25.21² =
  26. 26.21² =
  27. 27.51² =
  28. 28.41² =
  29. 29.21² =
  30. 30.39² =
  31. 31.69² =
  32. 32.51² =
  33. 33.21² =
  34. 34.31² =
  35. 35.41² =
  36. 36.49² =
  37. 37.21² =
  38. 38.81² =
  39. 39.71² =
  40. 40.59² =

Answer key

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

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