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Squares Trick Worksheet

Speed calculation lesson 10: Squares next to a ten · Set 324 · 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. 1.79² =
  2. 2.59² =
  3. 3.29² =
  4. 4.29² =
  5. 5.89² =
  6. 6.49² =
  7. 7.39² =
  8. 8.41² =
  9. 9.49² =
  10. 10.91² =
  11. 11.41² =
  12. 12.81² =
  13. 13.39² =
  14. 14.19² =
  15. 15.91² =
  16. 16.31² =
  17. 17.49² =
  18. 18.31² =
  19. 19.51² =
  20. 20.29² =
  21. 21.71² =
  22. 22.69² =
  23. 23.81² =
  24. 24.79² =
  25. 25.29² =
  26. 26.29² =
  27. 27.41² =
  28. 28.31² =
  29. 29.69² =
  30. 30.19² =
  31. 31.31² =
  32. 32.79² =
  33. 33.29² =
  34. 34.19² =
  35. 35.19² =
  36. 36.59² =
  37. 37.29² =
  38. 38.79² =
  39. 39.19² =
  40. 40.69² =

Answer key

  1. 6241
  2. 3481
  3. 841
  4. 841
  5. 7921
  6. 2401
  7. 1521
  8. 1681
  9. 2401
  10. 8281
  11. 1681
  12. 6561
  13. 1521
  14. 361
  15. 8281
  16. 961
  17. 2401
  18. 961
  19. 2601
  20. 841
  21. 5041
  22. 4761
  23. 6561
  24. 6241
  25. 841
  26. 841
  27. 1681
  28. 961
  29. 4761
  30. 361
  31. 961
  32. 6241
  33. 841
  34. 361
  35. 361
  36. 3481
  37. 841
  38. 6241
  39. 361
  40. 4761

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