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Squares Trick Worksheet

Speed calculation lesson 10: Squares next to a ten · Set 68 · 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. 1.31² =
  2. 2.59² =
  3. 3.69² =
  4. 4.19² =
  5. 5.71² =
  6. 6.89² =
  7. 7.51² =
  8. 8.31² =
  9. 9.89² =
  10. 10.71² =
  11. 11.21² =
  12. 12.41² =
  13. 13.69² =
  14. 14.29² =
  15. 15.81² =
  16. 16.19² =
  17. 17.79² =
  18. 18.71² =
  19. 19.71² =
  20. 20.29² =
  21. 21.31² =
  22. 22.61² =
  23. 23.31² =
  24. 24.31² =
  25. 25.19² =
  26. 26.61² =
  27. 27.71² =
  28. 28.41² =
  29. 29.51² =
  30. 30.29² =
  31. 31.71² =
  32. 32.39² =
  33. 33.61² =
  34. 34.29² =
  35. 35.21² =
  36. 36.59² =
  37. 37.21² =
  38. 38.19² =
  39. 39.19² =
  40. 40.39² =

Answer key

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

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