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Squares Trick Worksheet

Speed calculation lesson 10: Squares next to a ten · Set 519 · 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. 1.19² =
  2. 2.91² =
  3. 3.49² =
  4. 4.39² =
  5. 5.69² =
  6. 6.61² =
  7. 7.49² =
  8. 8.21² =
  9. 9.41² =
  10. 10.49² =
  11. 11.29² =
  12. 12.29² =
  13. 13.51² =
  14. 14.31² =
  15. 15.31² =
  16. 16.81² =
  17. 17.21² =
  18. 18.81² =
  19. 19.71² =
  20. 20.31² =
  21. 21.61² =
  22. 22.59² =
  23. 23.61² =
  24. 24.91² =
  25. 25.19² =
  26. 26.41² =
  27. 27.49² =
  28. 28.69² =
  29. 29.19² =
  30. 30.61² =
  31. 31.91² =
  32. 32.71² =
  33. 33.61² =
  34. 34.51² =
  35. 35.51² =
  36. 36.29² =
  37. 37.81² =
  38. 38.81² =
  39. 39.91² =
  40. 40.19² =

Answer key

  1. 361
  2. 8281
  3. 2401
  4. 1521
  5. 4761
  6. 3721
  7. 2401
  8. 441
  9. 1681
  10. 2401
  11. 841
  12. 841
  13. 2601
  14. 961
  15. 961
  16. 6561
  17. 441
  18. 6561
  19. 5041
  20. 961
  21. 3721
  22. 3481
  23. 3721
  24. 8281
  25. 361
  26. 1681
  27. 2401
  28. 4761
  29. 361
  30. 3721
  31. 8281
  32. 5041
  33. 3721
  34. 2601
  35. 2601
  36. 841
  37. 6561
  38. 6561
  39. 8281
  40. 361

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