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Squares Trick Worksheet

Speed calculation lesson 10: Squares next to a ten · Set 778 · 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. 1.51² =
  2. 2.41² =
  3. 3.79² =
  4. 4.69² =
  5. 5.79² =
  6. 6.89² =
  7. 7.59² =
  8. 8.21² =
  9. 9.29² =
  10. 10.31² =
  11. 11.81² =
  12. 12.29² =
  13. 13.39² =
  14. 14.89² =
  15. 15.61² =
  16. 16.19² =
  17. 17.41² =
  18. 18.71² =
  19. 19.91² =
  20. 20.31² =
  21. 21.59² =
  22. 22.89² =
  23. 23.61² =
  24. 24.51² =
  25. 25.59² =
  26. 26.71² =
  27. 27.61² =
  28. 28.19² =
  29. 29.29² =
  30. 30.31² =
  31. 31.29² =
  32. 32.59² =
  33. 33.31² =
  34. 34.89² =
  35. 35.81² =
  36. 36.41² =
  37. 37.69² =
  38. 38.89² =
  39. 39.31² =
  40. 40.69² =

Answer key

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

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