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Squares Trick Worksheet

Speed calculation lesson 10: Squares next to a ten · Set 502 · 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. 2.29² =
  3. 3.29² =
  4. 4.51² =
  5. 5.81² =
  6. 6.29² =
  7. 7.31² =
  8. 8.21² =
  9. 9.71² =
  10. 10.31² =
  11. 11.51² =
  12. 12.79² =
  13. 13.41² =
  14. 14.81² =
  15. 15.19² =
  16. 16.81² =
  17. 17.31² =
  18. 18.89² =
  19. 19.69² =
  20. 20.89² =
  21. 21.81² =
  22. 22.69² =
  23. 23.59² =
  24. 24.39² =
  25. 25.39² =
  26. 26.21² =
  27. 27.71² =
  28. 28.21² =
  29. 29.21² =
  30. 30.39² =
  31. 31.41² =
  32. 32.79² =
  33. 33.21² =
  34. 34.51² =
  35. 35.19² =
  36. 36.69² =
  37. 37.79² =
  38. 38.69² =
  39. 39.79² =
  40. 40.39² =

Answer key

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

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