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Squares Trick Worksheet

Speed calculation lesson 10: Squares next to a ten · Set 646 · 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. 1.71² =
  2. 2.81² =
  3. 3.69² =
  4. 4.71² =
  5. 5.89² =
  6. 6.89² =
  7. 7.91² =
  8. 8.89² =
  9. 9.91² =
  10. 10.69² =
  11. 11.69² =
  12. 12.49² =
  13. 13.39² =
  14. 14.21² =
  15. 15.69² =
  16. 16.69² =
  17. 17.89² =
  18. 18.89² =
  19. 19.49² =
  20. 20.19² =
  21. 21.41² =
  22. 22.39² =
  23. 23.29² =
  24. 24.21² =
  25. 25.81² =
  26. 26.19² =
  27. 27.91² =
  28. 28.91² =
  29. 29.81² =
  30. 30.39² =
  31. 31.41² =
  32. 32.51² =
  33. 33.61² =
  34. 34.39² =
  35. 35.41² =
  36. 36.39² =
  37. 37.49² =
  38. 38.31² =
  39. 39.21² =
  40. 40.51² =

Answer key

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

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