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Squares Trick Worksheet

Speed calculation lesson 10: Squares next to a ten · Set 454 · 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. 1.31² =
  2. 2.49² =
  3. 3.19² =
  4. 4.29² =
  5. 5.49² =
  6. 6.81² =
  7. 7.31² =
  8. 8.29² =
  9. 9.61² =
  10. 10.51² =
  11. 11.59² =
  12. 12.19² =
  13. 13.79² =
  14. 14.91² =
  15. 15.61² =
  16. 16.29² =
  17. 17.39² =
  18. 18.81² =
  19. 19.51² =
  20. 20.81² =
  21. 21.71² =
  22. 22.31² =
  23. 23.39² =
  24. 24.91² =
  25. 25.49² =
  26. 26.69² =
  27. 27.29² =
  28. 28.89² =
  29. 29.31² =
  30. 30.21² =
  31. 31.31² =
  32. 32.91² =
  33. 33.41² =
  34. 34.49² =
  35. 35.71² =
  36. 36.19² =
  37. 37.51² =
  38. 38.59² =
  39. 39.49² =
  40. 40.41² =

Answer key

  1. 961
  2. 2401
  3. 361
  4. 841
  5. 2401
  6. 6561
  7. 961
  8. 841
  9. 3721
  10. 2601
  11. 3481
  12. 361
  13. 6241
  14. 8281
  15. 3721
  16. 841
  17. 1521
  18. 6561
  19. 2601
  20. 6561
  21. 5041
  22. 961
  23. 1521
  24. 8281
  25. 2401
  26. 4761
  27. 841
  28. 7921
  29. 961
  30. 441
  31. 961
  32. 8281
  33. 1681
  34. 2401
  35. 5041
  36. 361
  37. 2601
  38. 3481
  39. 2401
  40. 1681

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