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Squares Trick Worksheet

Speed calculation lesson 10: Squares next to a ten · Set 215 · 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. 1.91² =
  2. 2.29² =
  3. 3.89² =
  4. 4.29² =
  5. 5.81² =
  6. 6.29² =
  7. 7.69² =
  8. 8.39² =
  9. 9.39² =
  10. 10.61² =
  11. 11.89² =
  12. 12.49² =
  13. 13.49² =
  14. 14.91² =
  15. 15.71² =
  16. 16.29² =
  17. 17.29² =
  18. 18.69² =
  19. 19.71² =
  20. 20.49² =
  21. 21.51² =
  22. 22.71² =
  23. 23.21² =
  24. 24.71² =
  25. 25.61² =
  26. 26.49² =
  27. 27.59² =
  28. 28.21² =
  29. 29.61² =
  30. 30.31² =
  31. 31.91² =
  32. 32.31² =
  33. 33.69² =
  34. 34.49² =
  35. 35.59² =
  36. 36.41² =
  37. 37.81² =
  38. 38.41² =
  39. 39.71² =
  40. 40.49² =

Answer key

  1. 8281
  2. 841
  3. 7921
  4. 841
  5. 6561
  6. 841
  7. 4761
  8. 1521
  9. 1521
  10. 3721
  11. 7921
  12. 2401
  13. 2401
  14. 8281
  15. 5041
  16. 841
  17. 841
  18. 4761
  19. 5041
  20. 2401
  21. 2601
  22. 5041
  23. 441
  24. 5041
  25. 3721
  26. 2401
  27. 3481
  28. 441
  29. 3721
  30. 961
  31. 8281
  32. 961
  33. 4761
  34. 2401
  35. 3481
  36. 1681
  37. 6561
  38. 1681
  39. 5041
  40. 2401

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