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Squares Trick Worksheet

Speed calculation lesson 10: Squares next to a ten · Set 758 · 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. 1.39² =
  2. 2.31² =
  3. 3.49² =
  4. 4.91² =
  5. 5.31² =
  6. 6.69² =
  7. 7.19² =
  8. 8.19² =
  9. 9.69² =
  10. 10.59² =
  11. 11.39² =
  12. 12.41² =
  13. 13.19² =
  14. 14.41² =
  15. 15.69² =
  16. 16.79² =
  17. 17.19² =
  18. 18.41² =
  19. 19.79² =
  20. 20.31² =
  21. 21.29² =
  22. 22.71² =
  23. 23.91² =
  24. 24.19² =
  25. 25.89² =
  26. 26.79² =
  27. 27.79² =
  28. 28.81² =
  29. 29.29² =
  30. 30.81² =
  31. 31.21² =
  32. 32.51² =
  33. 33.41² =
  34. 34.51² =
  35. 35.39² =
  36. 36.61² =
  37. 37.41² =
  38. 38.51² =
  39. 39.79² =
  40. 40.69² =

Answer key

  1. 1521
  2. 961
  3. 2401
  4. 8281
  5. 961
  6. 4761
  7. 361
  8. 361
  9. 4761
  10. 3481
  11. 1521
  12. 1681
  13. 361
  14. 1681
  15. 4761
  16. 6241
  17. 361
  18. 1681
  19. 6241
  20. 961
  21. 841
  22. 5041
  23. 8281
  24. 361
  25. 7921
  26. 6241
  27. 6241
  28. 6561
  29. 841
  30. 6561
  31. 441
  32. 2601
  33. 1681
  34. 2601
  35. 1521
  36. 3721
  37. 1681
  38. 2601
  39. 6241
  40. 4761

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