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Squares Trick Worksheet

Speed calculation lesson 10: Squares next to a ten · Set 467 · 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. 2.91² =
  3. 3.49² =
  4. 4.29² =
  5. 5.51² =
  6. 6.21² =
  7. 7.19² =
  8. 8.89² =
  9. 9.69² =
  10. 10.59² =
  11. 11.91² =
  12. 12.69² =
  13. 13.69² =
  14. 14.81² =
  15. 15.51² =
  16. 16.41² =
  17. 17.79² =
  18. 18.89² =
  19. 19.89² =
  20. 20.29² =
  21. 21.81² =
  22. 22.71² =
  23. 23.79² =
  24. 24.41² =
  25. 25.59² =
  26. 26.51² =
  27. 27.81² =
  28. 28.59² =
  29. 29.31² =
  30. 30.49² =
  31. 31.31² =
  32. 32.51² =
  33. 33.31² =
  34. 34.29² =
  35. 35.61² =
  36. 36.61² =
  37. 37.69² =
  38. 38.51² =
  39. 39.91² =
  40. 40.41² =

Answer key

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

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