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Squares Trick Worksheet

Speed calculation lesson 10: Squares next to a ten · Set 232 · 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. 2.19² =
  3. 3.91² =
  4. 4.29² =
  5. 5.19² =
  6. 6.89² =
  7. 7.29² =
  8. 8.69² =
  9. 9.89² =
  10. 10.91² =
  11. 11.49² =
  12. 12.81² =
  13. 13.91² =
  14. 14.19² =
  15. 15.49² =
  16. 16.41² =
  17. 17.19² =
  18. 18.91² =
  19. 19.71² =
  20. 20.81² =
  21. 21.21² =
  22. 22.89² =
  23. 23.39² =
  24. 24.69² =
  25. 25.81² =
  26. 26.69² =
  27. 27.59² =
  28. 28.61² =
  29. 29.39² =
  30. 30.39² =
  31. 31.89² =
  32. 32.29² =
  33. 33.69² =
  34. 34.49² =
  35. 35.31² =
  36. 36.89² =
  37. 37.91² =
  38. 38.29² =
  39. 39.19² =
  40. 40.31² =

Answer key

  1. 8281
  2. 361
  3. 8281
  4. 841
  5. 361
  6. 7921
  7. 841
  8. 4761
  9. 7921
  10. 8281
  11. 2401
  12. 6561
  13. 8281
  14. 361
  15. 2401
  16. 1681
  17. 361
  18. 8281
  19. 5041
  20. 6561
  21. 441
  22. 7921
  23. 1521
  24. 4761
  25. 6561
  26. 4761
  27. 3481
  28. 3721
  29. 1521
  30. 1521
  31. 7921
  32. 841
  33. 4761
  34. 2401
  35. 961
  36. 7921
  37. 8281
  38. 841
  39. 361
  40. 961

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