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Squares Trick Worksheet

Speed calculation lesson 10: Squares next to a ten · Set 314 · 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. 2.39² =
  3. 3.51² =
  4. 4.71² =
  5. 5.49² =
  6. 6.29² =
  7. 7.81² =
  8. 8.81² =
  9. 9.19² =
  10. 10.29² =
  11. 11.61² =
  12. 12.49² =
  13. 13.51² =
  14. 14.21² =
  15. 15.81² =
  16. 16.19² =
  17. 17.51² =
  18. 18.31² =
  19. 19.89² =
  20. 20.29² =
  21. 21.31² =
  22. 22.39² =
  23. 23.29² =
  24. 24.91² =
  25. 25.39² =
  26. 26.61² =
  27. 27.39² =
  28. 28.29² =
  29. 29.29² =
  30. 30.49² =
  31. 31.59² =
  32. 32.69² =
  33. 33.19² =
  34. 34.89² =
  35. 35.31² =
  36. 36.51² =
  37. 37.49² =
  38. 38.69² =
  39. 39.29² =
  40. 40.71² =

Answer key

  1. 3481
  2. 1521
  3. 2601
  4. 5041
  5. 2401
  6. 841
  7. 6561
  8. 6561
  9. 361
  10. 841
  11. 3721
  12. 2401
  13. 2601
  14. 441
  15. 6561
  16. 361
  17. 2601
  18. 961
  19. 7921
  20. 841
  21. 961
  22. 1521
  23. 841
  24. 8281
  25. 1521
  26. 3721
  27. 1521
  28. 841
  29. 841
  30. 2401
  31. 3481
  32. 4761
  33. 361
  34. 7921
  35. 961
  36. 2601
  37. 2401
  38. 4761
  39. 841
  40. 5041

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