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Squares Trick Worksheet

Speed calculation lesson 10: Squares next to a ten · Set 206 · 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. 2.29² =
  3. 3.39² =
  4. 4.71² =
  5. 5.19² =
  6. 6.29² =
  7. 7.41² =
  8. 8.69² =
  9. 9.49² =
  10. 10.29² =
  11. 11.19² =
  12. 12.31² =
  13. 13.19² =
  14. 14.19² =
  15. 15.41² =
  16. 16.19² =
  17. 17.69² =
  18. 18.69² =
  19. 19.59² =
  20. 20.91² =
  21. 21.31² =
  22. 22.49² =
  23. 23.29² =
  24. 24.19² =
  25. 25.59² =
  26. 26.49² =
  27. 27.21² =
  28. 28.89² =
  29. 29.41² =
  30. 30.89² =
  31. 31.59² =
  32. 32.89² =
  33. 33.91² =
  34. 34.39² =
  35. 35.29² =
  36. 36.59² =
  37. 37.89² =
  38. 38.91² =
  39. 39.59² =
  40. 40.31² =

Answer key

  1. 3481
  2. 841
  3. 1521
  4. 5041
  5. 361
  6. 841
  7. 1681
  8. 4761
  9. 2401
  10. 841
  11. 361
  12. 961
  13. 361
  14. 361
  15. 1681
  16. 361
  17. 4761
  18. 4761
  19. 3481
  20. 8281
  21. 961
  22. 2401
  23. 841
  24. 361
  25. 3481
  26. 2401
  27. 441
  28. 7921
  29. 1681
  30. 7921
  31. 3481
  32. 7921
  33. 8281
  34. 1521
  35. 841
  36. 3481
  37. 7921
  38. 8281
  39. 3481
  40. 961

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