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Squares Trick Worksheet

Speed calculation lesson 10: Squares next to a ten · Set 505 · 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. 1.69² =
  2. 2.89² =
  3. 3.61² =
  4. 4.71² =
  5. 5.81² =
  6. 6.79² =
  7. 7.21² =
  8. 8.19² =
  9. 9.29² =
  10. 10.19² =
  11. 11.61² =
  12. 12.41² =
  13. 13.69² =
  14. 14.81² =
  15. 15.51² =
  16. 16.41² =
  17. 17.29² =
  18. 18.39² =
  19. 19.81² =
  20. 20.21² =
  21. 21.89² =
  22. 22.61² =
  23. 23.31² =
  24. 24.91² =
  25. 25.19² =
  26. 26.91² =
  27. 27.39² =
  28. 28.21² =
  29. 29.39² =
  30. 30.21² =
  31. 31.19² =
  32. 32.51² =
  33. 33.39² =
  34. 34.41² =
  35. 35.41² =
  36. 36.51² =
  37. 37.41² =
  38. 38.21² =
  39. 39.41² =
  40. 40.79² =

Answer key

  1. 4761
  2. 7921
  3. 3721
  4. 5041
  5. 6561
  6. 6241
  7. 441
  8. 361
  9. 841
  10. 361
  11. 3721
  12. 1681
  13. 4761
  14. 6561
  15. 2601
  16. 1681
  17. 841
  18. 1521
  19. 6561
  20. 441
  21. 7921
  22. 3721
  23. 961
  24. 8281
  25. 361
  26. 8281
  27. 1521
  28. 441
  29. 1521
  30. 441
  31. 361
  32. 2601
  33. 1521
  34. 1681
  35. 1681
  36. 2601
  37. 1681
  38. 441
  39. 1681
  40. 6241

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