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Squares Trick Worksheet

Speed calculation lesson 10: Squares next to a ten · Set 493 · 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. 1.29² =
  2. 2.51² =
  3. 3.59² =
  4. 4.29² =
  5. 5.39² =
  6. 6.19² =
  7. 7.69² =
  8. 8.29² =
  9. 9.69² =
  10. 10.59² =
  11. 11.41² =
  12. 12.91² =
  13. 13.89² =
  14. 14.29² =
  15. 15.89² =
  16. 16.41² =
  17. 17.81² =
  18. 18.41² =
  19. 19.89² =
  20. 20.19² =
  21. 21.21² =
  22. 22.91² =
  23. 23.19² =
  24. 24.39² =
  25. 25.51² =
  26. 26.81² =
  27. 27.29² =
  28. 28.21² =
  29. 29.49² =
  30. 30.71² =
  31. 31.49² =
  32. 32.41² =
  33. 33.21² =
  34. 34.19² =
  35. 35.91² =
  36. 36.89² =
  37. 37.51² =
  38. 38.31² =
  39. 39.81² =
  40. 40.29² =

Answer key

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

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