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Squares Trick Worksheet

Speed calculation lesson 10: Squares next to a ten · Set 438 · 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. 1.31² =
  2. 2.81² =
  3. 3.89² =
  4. 4.51² =
  5. 5.29² =
  6. 6.69² =
  7. 7.31² =
  8. 8.19² =
  9. 9.89² =
  10. 10.49² =
  11. 11.69² =
  12. 12.39² =
  13. 13.69² =
  14. 14.31² =
  15. 15.89² =
  16. 16.61² =
  17. 17.69² =
  18. 18.59² =
  19. 19.31² =
  20. 20.59² =
  21. 21.19² =
  22. 22.61² =
  23. 23.19² =
  24. 24.41² =
  25. 25.31² =
  26. 26.21² =
  27. 27.69² =
  28. 28.39² =
  29. 29.81² =
  30. 30.61² =
  31. 31.89² =
  32. 32.29² =
  33. 33.31² =
  34. 34.29² =
  35. 35.59² =
  36. 36.59² =
  37. 37.59² =
  38. 38.29² =
  39. 39.69² =
  40. 40.71² =

Answer key

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

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