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Squares Trick Worksheet

Speed calculation lesson 10: Squares next to a ten · Set 775 · 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. 1.61² =
  2. 2.39² =
  3. 3.71² =
  4. 4.31² =
  5. 5.51² =
  6. 6.39² =
  7. 7.81² =
  8. 8.89² =
  9. 9.31² =
  10. 10.49² =
  11. 11.89² =
  12. 12.31² =
  13. 13.21² =
  14. 14.41² =
  15. 15.21² =
  16. 16.19² =
  17. 17.59² =
  18. 18.39² =
  19. 19.69² =
  20. 20.29² =
  21. 21.39² =
  22. 22.59² =
  23. 23.79² =
  24. 24.89² =
  25. 25.71² =
  26. 26.61² =
  27. 27.31² =
  28. 28.49² =
  29. 29.61² =
  30. 30.59² =
  31. 31.81² =
  32. 32.79² =
  33. 33.21² =
  34. 34.41² =
  35. 35.39² =
  36. 36.41² =
  37. 37.69² =
  38. 38.69² =
  39. 39.31² =
  40. 40.51² =

Answer key

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

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