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Squares Trick Worksheet

Speed calculation lesson 10: Squares next to a ten · Set 125 · 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. 1.61² =
  2. 2.89² =
  3. 3.91² =
  4. 4.71² =
  5. 5.21² =
  6. 6.51² =
  7. 7.89² =
  8. 8.41² =
  9. 9.21² =
  10. 10.29² =
  11. 11.31² =
  12. 12.61² =
  13. 13.91² =
  14. 14.91² =
  15. 15.51² =
  16. 16.19² =
  17. 17.31² =
  18. 18.41² =
  19. 19.69² =
  20. 20.29² =
  21. 21.69² =
  22. 22.51² =
  23. 23.41² =
  24. 24.59² =
  25. 25.31² =
  26. 26.79² =
  27. 27.19² =
  28. 28.81² =
  29. 29.39² =
  30. 30.31² =
  31. 31.61² =
  32. 32.81² =
  33. 33.51² =
  34. 34.69² =
  35. 35.71² =
  36. 36.21² =
  37. 37.59² =
  38. 38.61² =
  39. 39.91² =
  40. 40.41² =

Answer key

  1. 3721
  2. 7921
  3. 8281
  4. 5041
  5. 441
  6. 2601
  7. 7921
  8. 1681
  9. 441
  10. 841
  11. 961
  12. 3721
  13. 8281
  14. 8281
  15. 2601
  16. 361
  17. 961
  18. 1681
  19. 4761
  20. 841
  21. 4761
  22. 2601
  23. 1681
  24. 3481
  25. 961
  26. 6241
  27. 361
  28. 6561
  29. 1521
  30. 961
  31. 3721
  32. 6561
  33. 2601
  34. 4761
  35. 5041
  36. 441
  37. 3481
  38. 3721
  39. 8281
  40. 1681

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