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Squares Trick Worksheet

Speed calculation lesson 10: Squares next to a ten · Set 549 · 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. 1.49² =
  2. 2.91² =
  3. 3.59² =
  4. 4.29² =
  5. 5.19² =
  6. 6.69² =
  7. 7.59² =
  8. 8.19² =
  9. 9.21² =
  10. 10.81² =
  11. 11.49² =
  12. 12.21² =
  13. 13.51² =
  14. 14.21² =
  15. 15.89² =
  16. 16.41² =
  17. 17.59² =
  18. 18.89² =
  19. 19.51² =
  20. 20.29² =
  21. 21.41² =
  22. 22.69² =
  23. 23.31² =
  24. 24.21² =
  25. 25.61² =
  26. 26.49² =
  27. 27.91² =
  28. 28.81² =
  29. 29.71² =
  30. 30.49² =
  31. 31.51² =
  32. 32.31² =
  33. 33.39² =
  34. 34.31² =
  35. 35.29² =
  36. 36.31² =
  37. 37.91² =
  38. 38.29² =
  39. 39.61² =
  40. 40.91² =

Answer key

  1. 2401
  2. 8281
  3. 3481
  4. 841
  5. 361
  6. 4761
  7. 3481
  8. 361
  9. 441
  10. 6561
  11. 2401
  12. 441
  13. 2601
  14. 441
  15. 7921
  16. 1681
  17. 3481
  18. 7921
  19. 2601
  20. 841
  21. 1681
  22. 4761
  23. 961
  24. 441
  25. 3721
  26. 2401
  27. 8281
  28. 6561
  29. 5041
  30. 2401
  31. 2601
  32. 961
  33. 1521
  34. 961
  35. 841
  36. 961
  37. 8281
  38. 841
  39. 3721
  40. 8281

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