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Squares Trick Worksheet

Speed calculation lesson 10: Squares next to a ten · Set 627 · 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. 2.21² =
  3. 3.31² =
  4. 4.69² =
  5. 5.81² =
  6. 6.31² =
  7. 7.91² =
  8. 8.81² =
  9. 9.49² =
  10. 10.41² =
  11. 11.21² =
  12. 12.81² =
  13. 13.29² =
  14. 14.51² =
  15. 15.41² =
  16. 16.19² =
  17. 17.59² =
  18. 18.69² =
  19. 19.21² =
  20. 20.49² =
  21. 21.89² =
  22. 22.29² =
  23. 23.91² =
  24. 24.71² =
  25. 25.71² =
  26. 26.41² =
  27. 27.49² =
  28. 28.29² =
  29. 29.69² =
  30. 30.81² =
  31. 31.81² =
  32. 32.91² =
  33. 33.59² =
  34. 34.71² =
  35. 35.51² =
  36. 36.31² =
  37. 37.79² =
  38. 38.61² =
  39. 39.49² =
  40. 40.81² =

Answer key

  1. 961
  2. 441
  3. 961
  4. 4761
  5. 6561
  6. 961
  7. 8281
  8. 6561
  9. 2401
  10. 1681
  11. 441
  12. 6561
  13. 841
  14. 2601
  15. 1681
  16. 361
  17. 3481
  18. 4761
  19. 441
  20. 2401
  21. 7921
  22. 841
  23. 8281
  24. 5041
  25. 5041
  26. 1681
  27. 2401
  28. 841
  29. 4761
  30. 6561
  31. 6561
  32. 8281
  33. 3481
  34. 5041
  35. 2601
  36. 961
  37. 6241
  38. 3721
  39. 2401
  40. 6561

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