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Squares Trick Worksheet

Speed calculation lesson 10: Squares next to a ten · Set 873 · 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. 2.61² =
  3. 3.91² =
  4. 4.59² =
  5. 5.19² =
  6. 6.51² =
  7. 7.71² =
  8. 8.91² =
  9. 9.19² =
  10. 10.61² =
  11. 11.69² =
  12. 12.89² =
  13. 13.61² =
  14. 14.61² =
  15. 15.71² =
  16. 16.61² =
  17. 17.89² =
  18. 18.19² =
  19. 19.81² =
  20. 20.81² =
  21. 21.71² =
  22. 22.49² =
  23. 23.51² =
  24. 24.51² =
  25. 25.39² =
  26. 26.61² =
  27. 27.81² =
  28. 28.51² =
  29. 29.19² =
  30. 30.71² =
  31. 31.31² =
  32. 32.91² =
  33. 33.19² =
  34. 34.71² =
  35. 35.21² =
  36. 36.39² =
  37. 37.21² =
  38. 38.79² =
  39. 39.69² =
  40. 40.69² =

Answer key

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

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