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Squares Trick Worksheet

Speed calculation lesson 10: Squares next to a ten · Set 378 · 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. 2.41² =
  3. 3.89² =
  4. 4.59² =
  5. 5.71² =
  6. 6.81² =
  7. 7.91² =
  8. 8.81² =
  9. 9.31² =
  10. 10.69² =
  11. 11.79² =
  12. 12.19² =
  13. 13.19² =
  14. 14.71² =
  15. 15.59² =
  16. 16.79² =
  17. 17.39² =
  18. 18.51² =
  19. 19.81² =
  20. 20.29² =
  21. 21.19² =
  22. 22.61² =
  23. 23.49² =
  24. 24.31² =
  25. 25.19² =
  26. 26.29² =
  27. 27.59² =
  28. 28.71² =
  29. 29.31² =
  30. 30.79² =
  31. 31.51² =
  32. 32.69² =
  33. 33.19² =
  34. 34.39² =
  35. 35.31² =
  36. 36.19² =
  37. 37.19² =
  38. 38.51² =
  39. 39.41² =
  40. 40.71² =

Answer key

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

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