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Squares Trick Worksheet

Speed calculation lesson 10: Squares next to a ten · Set 400 · 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. 1.51² =
  2. 2.21² =
  3. 3.89² =
  4. 4.29² =
  5. 5.71² =
  6. 6.21² =
  7. 7.29² =
  8. 8.21² =
  9. 9.49² =
  10. 10.19² =
  11. 11.31² =
  12. 12.59² =
  13. 13.21² =
  14. 14.69² =
  15. 15.81² =
  16. 16.79² =
  17. 17.81² =
  18. 18.31² =
  19. 19.19² =
  20. 20.51² =
  21. 21.59² =
  22. 22.19² =
  23. 23.41² =
  24. 24.51² =
  25. 25.19² =
  26. 26.19² =
  27. 27.81² =
  28. 28.79² =
  29. 29.79² =
  30. 30.69² =
  31. 31.31² =
  32. 32.81² =
  33. 33.31² =
  34. 34.29² =
  35. 35.19² =
  36. 36.41² =
  37. 37.29² =
  38. 38.59² =
  39. 39.89² =
  40. 40.41² =

Answer key

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

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