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Squares Trick Worksheet

Speed calculation lesson 10: Squares next to a ten · Set 25 · 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. 1.81² =
  2. 2.89² =
  3. 3.39² =
  4. 4.61² =
  5. 5.51² =
  6. 6.69² =
  7. 7.49² =
  8. 8.21² =
  9. 9.21² =
  10. 10.91² =
  11. 11.41² =
  12. 12.41² =
  13. 13.69² =
  14. 14.81² =
  15. 15.41² =
  16. 16.71² =
  17. 17.39² =
  18. 18.69² =
  19. 19.39² =
  20. 20.89² =
  21. 21.21² =
  22. 22.71² =
  23. 23.19² =
  24. 24.31² =
  25. 25.19² =
  26. 26.91² =
  27. 27.91² =
  28. 28.89² =
  29. 29.91² =
  30. 30.41² =
  31. 31.89² =
  32. 32.89² =
  33. 33.29² =
  34. 34.51² =
  35. 35.49² =
  36. 36.51² =
  37. 37.29² =
  38. 38.51² =
  39. 39.69² =
  40. 40.31² =

Answer key

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

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