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Squares Trick Worksheet

Speed calculation lesson 10: Squares next to a ten · Set 444 · 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. 1.61² =
  2. 2.91² =
  3. 3.29² =
  4. 4.51² =
  5. 5.81² =
  6. 6.89² =
  7. 7.51² =
  8. 8.41² =
  9. 9.39² =
  10. 10.19² =
  11. 11.29² =
  12. 12.39² =
  13. 13.61² =
  14. 14.31² =
  15. 15.21² =
  16. 16.51² =
  17. 17.91² =
  18. 18.81² =
  19. 19.89² =
  20. 20.51² =
  21. 21.19² =
  22. 22.31² =
  23. 23.19² =
  24. 24.71² =
  25. 25.21² =
  26. 26.41² =
  27. 27.79² =
  28. 28.21² =
  29. 29.59² =
  30. 30.59² =
  31. 31.49² =
  32. 32.59² =
  33. 33.79² =
  34. 34.79² =
  35. 35.79² =
  36. 36.49² =
  37. 37.79² =
  38. 38.59² =
  39. 39.81² =
  40. 40.69² =

Answer key

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

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