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Squares Trick Worksheet

Speed calculation lesson 10: Squares next to a ten · Set 2 · 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. 1.81² =
  2. 2.81² =
  3. 3.39² =
  4. 4.49² =
  5. 5.39² =
  6. 6.81² =
  7. 7.41² =
  8. 8.29² =
  9. 9.59² =
  10. 10.89² =
  11. 11.19² =
  12. 12.21² =
  13. 13.41² =
  14. 14.21² =
  15. 15.61² =
  16. 16.51² =
  17. 17.49² =
  18. 18.51² =
  19. 19.89² =
  20. 20.71² =
  21. 21.79² =
  22. 22.49² =
  23. 23.71² =
  24. 24.89² =
  25. 25.39² =
  26. 26.49² =
  27. 27.19² =
  28. 28.69² =
  29. 29.19² =
  30. 30.51² =
  31. 31.59² =
  32. 32.49² =
  33. 33.41² =
  34. 34.69² =
  35. 35.31² =
  36. 36.69² =
  37. 37.41² =
  38. 38.79² =
  39. 39.71² =
  40. 40.91² =

Answer key

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

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