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Squares Trick Worksheet

Speed calculation lesson 10: Squares next to a ten · Set 492 · 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. 1.51² =
  2. 2.51² =
  3. 3.19² =
  4. 4.51² =
  5. 5.89² =
  6. 6.61² =
  7. 7.91² =
  8. 8.61² =
  9. 9.59² =
  10. 10.21² =
  11. 11.21² =
  12. 12.39² =
  13. 13.59² =
  14. 14.59² =
  15. 15.51² =
  16. 16.19² =
  17. 17.41² =
  18. 18.29² =
  19. 19.59² =
  20. 20.39² =
  21. 21.39² =
  22. 22.61² =
  23. 23.49² =
  24. 24.21² =
  25. 25.19² =
  26. 26.21² =
  27. 27.41² =
  28. 28.89² =
  29. 29.41² =
  30. 30.59² =
  31. 31.69² =
  32. 32.89² =
  33. 33.31² =
  34. 34.21² =
  35. 35.51² =
  36. 36.19² =
  37. 37.61² =
  38. 38.49² =
  39. 39.39² =
  40. 40.71² =

Answer key

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

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