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Squares Trick Worksheet

Speed calculation lesson 10: Squares next to a ten · Set 781 · 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. 2.21² =
  3. 3.49² =
  4. 4.41² =
  5. 5.89² =
  6. 6.89² =
  7. 7.31² =
  8. 8.61² =
  9. 9.19² =
  10. 10.71² =
  11. 11.21² =
  12. 12.49² =
  13. 13.29² =
  14. 14.21² =
  15. 15.69² =
  16. 16.49² =
  17. 17.71² =
  18. 18.81² =
  19. 19.21² =
  20. 20.51² =
  21. 21.79² =
  22. 22.19² =
  23. 23.81² =
  24. 24.19² =
  25. 25.81² =
  26. 26.41² =
  27. 27.81² =
  28. 28.21² =
  29. 29.59² =
  30. 30.31² =
  31. 31.21² =
  32. 32.39² =
  33. 33.29² =
  34. 34.61² =
  35. 35.59² =
  36. 36.29² =
  37. 37.51² =
  38. 38.71² =
  39. 39.79² =
  40. 40.31² =

Answer key

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

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