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Squares Trick Worksheet

Speed calculation lesson 10: Squares next to a ten · Set 34 · 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. 2.31² =
  3. 3.81² =
  4. 4.59² =
  5. 5.59² =
  6. 6.51² =
  7. 7.19² =
  8. 8.91² =
  9. 9.81² =
  10. 10.29² =
  11. 11.59² =
  12. 12.49² =
  13. 13.59² =
  14. 14.89² =
  15. 15.49² =
  16. 16.39² =
  17. 17.61² =
  18. 18.91² =
  19. 19.29² =
  20. 20.51² =
  21. 21.21² =
  22. 22.61² =
  23. 23.39² =
  24. 24.19² =
  25. 25.41² =
  26. 26.51² =
  27. 27.19² =
  28. 28.29² =
  29. 29.39² =
  30. 30.39² =
  31. 31.31² =
  32. 32.79² =
  33. 33.79² =
  34. 34.21² =
  35. 35.51² =
  36. 36.69² =
  37. 37.19² =
  38. 38.19² =
  39. 39.71² =
  40. 40.49² =

Answer key

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

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