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Squares Trick Worksheet

Speed calculation lesson 10: Squares next to a ten · Set 325 · 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. 1.81² =
  2. 2.41² =
  3. 3.31² =
  4. 4.29² =
  5. 5.41² =
  6. 6.81² =
  7. 7.21² =
  8. 8.81² =
  9. 9.31² =
  10. 10.71² =
  11. 11.81² =
  12. 12.29² =
  13. 13.79² =
  14. 14.19² =
  15. 15.29² =
  16. 16.19² =
  17. 17.71² =
  18. 18.91² =
  19. 19.89² =
  20. 20.31² =
  21. 21.19² =
  22. 22.91² =
  23. 23.29² =
  24. 24.29² =
  25. 25.51² =
  26. 26.89² =
  27. 27.69² =
  28. 28.29² =
  29. 29.39² =
  30. 30.21² =
  31. 31.89² =
  32. 32.19² =
  33. 33.79² =
  34. 34.79² =
  35. 35.79² =
  36. 36.41² =
  37. 37.61² =
  38. 38.29² =
  39. 39.59² =
  40. 40.81² =

Answer key

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

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