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Squares Trick Worksheet

Speed calculation lesson 10: Squares next to a ten · Set 100 · 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. 1.29² =
  2. 2.79² =
  3. 3.79² =
  4. 4.19² =
  5. 5.79² =
  6. 6.59² =
  7. 7.89² =
  8. 8.39² =
  9. 9.41² =
  10. 10.31² =
  11. 11.61² =
  12. 12.81² =
  13. 13.31² =
  14. 14.51² =
  15. 15.81² =
  16. 16.19² =
  17. 17.21² =
  18. 18.21² =
  19. 19.71² =
  20. 20.41² =
  21. 21.29² =
  22. 22.89² =
  23. 23.19² =
  24. 24.49² =
  25. 25.79² =
  26. 26.59² =
  27. 27.29² =
  28. 28.39² =
  29. 29.29² =
  30. 30.29² =
  31. 31.31² =
  32. 32.41² =
  33. 33.71² =
  34. 34.29² =
  35. 35.59² =
  36. 36.51² =
  37. 37.59² =
  38. 38.71² =
  39. 39.71² =
  40. 40.29² =

Answer key

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

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