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Squares Trick Worksheet

Speed calculation lesson 10: Squares next to a ten · Set 218 · 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. 1.29² =
  2. 2.81² =
  3. 3.69² =
  4. 4.29² =
  5. 5.19² =
  6. 6.51² =
  7. 7.19² =
  8. 8.51² =
  9. 9.89² =
  10. 10.49² =
  11. 11.81² =
  12. 12.29² =
  13. 13.79² =
  14. 14.41² =
  15. 15.89² =
  16. 16.19² =
  17. 17.59² =
  18. 18.49² =
  19. 19.89² =
  20. 20.69² =
  21. 21.79² =
  22. 22.19² =
  23. 23.19² =
  24. 24.89² =
  25. 25.89² =
  26. 26.91² =
  27. 27.89² =
  28. 28.29² =
  29. 29.81² =
  30. 30.31² =
  31. 31.19² =
  32. 32.59² =
  33. 33.61² =
  34. 34.19² =
  35. 35.41² =
  36. 36.19² =
  37. 37.49² =
  38. 38.69² =
  39. 39.91² =
  40. 40.21² =

Answer key

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

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