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Squares Trick Worksheet

Speed calculation lesson 10: Squares next to a ten · Set 691 · 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. 1.21² =
  2. 2.59² =
  3. 3.71² =
  4. 4.79² =
  5. 5.21² =
  6. 6.51² =
  7. 7.59² =
  8. 8.41² =
  9. 9.39² =
  10. 10.71² =
  11. 11.29² =
  12. 12.81² =
  13. 13.41² =
  14. 14.79² =
  15. 15.51² =
  16. 16.19² =
  17. 17.29² =
  18. 18.81² =
  19. 19.91² =
  20. 20.61² =
  21. 21.89² =
  22. 22.79² =
  23. 23.29² =
  24. 24.29² =
  25. 25.61² =
  26. 26.19² =
  27. 27.51² =
  28. 28.61² =
  29. 29.19² =
  30. 30.81² =
  31. 31.69² =
  32. 32.29² =
  33. 33.29² =
  34. 34.41² =
  35. 35.81² =
  36. 36.19² =
  37. 37.31² =
  38. 38.31² =
  39. 39.39² =
  40. 40.21² =

Answer key

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

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