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Squares Trick Worksheet

Speed calculation lesson 10: Squares next to a ten · Set 318 · 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. 1.59² =
  2. 2.21² =
  3. 3.59² =
  4. 4.61² =
  5. 5.61² =
  6. 6.39² =
  7. 7.51² =
  8. 8.49² =
  9. 9.51² =
  10. 10.29² =
  11. 11.21² =
  12. 12.31² =
  13. 13.61² =
  14. 14.59² =
  15. 15.29² =
  16. 16.61² =
  17. 17.39² =
  18. 18.71² =
  19. 19.81² =
  20. 20.19² =
  21. 21.69² =
  22. 22.41² =
  23. 23.39² =
  24. 24.59² =
  25. 25.39² =
  26. 26.89² =
  27. 27.19² =
  28. 28.31² =
  29. 29.69² =
  30. 30.61² =
  31. 31.21² =
  32. 32.59² =
  33. 33.29² =
  34. 34.31² =
  35. 35.61² =
  36. 36.51² =
  37. 37.59² =
  38. 38.31² =
  39. 39.31² =
  40. 40.31² =

Answer key

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

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