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Squares Trick Worksheet

Speed calculation lesson 10: Squares next to a ten · Set 415 · 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. 1.41² =
  2. 2.81² =
  3. 3.49² =
  4. 4.59² =
  5. 5.89² =
  6. 6.19² =
  7. 7.89² =
  8. 8.69² =
  9. 9.79² =
  10. 10.19² =
  11. 11.59² =
  12. 12.31² =
  13. 13.51² =
  14. 14.79² =
  15. 15.91² =
  16. 16.41² =
  17. 17.59² =
  18. 18.19² =
  19. 19.49² =
  20. 20.49² =
  21. 21.61² =
  22. 22.69² =
  23. 23.21² =
  24. 24.21² =
  25. 25.79² =
  26. 26.59² =
  27. 27.29² =
  28. 28.89² =
  29. 29.29² =
  30. 30.29² =
  31. 31.51² =
  32. 32.59² =
  33. 33.39² =
  34. 34.69² =
  35. 35.61² =
  36. 36.91² =
  37. 37.39² =
  38. 38.59² =
  39. 39.31² =
  40. 40.31² =

Answer key

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

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