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Squares Trick Worksheet

Speed calculation lesson 10: Squares next to a ten · Set 701 · 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. 1.21² =
  2. 2.31² =
  3. 3.21² =
  4. 4.61² =
  5. 5.69² =
  6. 6.49² =
  7. 7.29² =
  8. 8.51² =
  9. 9.19² =
  10. 10.79² =
  11. 11.31² =
  12. 12.69² =
  13. 13.59² =
  14. 14.21² =
  15. 15.61² =
  16. 16.19² =
  17. 17.69² =
  18. 18.21² =
  19. 19.29² =
  20. 20.31² =
  21. 21.39² =
  22. 22.79² =
  23. 23.89² =
  24. 24.41² =
  25. 25.21² =
  26. 26.91² =
  27. 27.89² =
  28. 28.69² =
  29. 29.59² =
  30. 30.61² =
  31. 31.49² =
  32. 32.91² =
  33. 33.29² =
  34. 34.31² =
  35. 35.61² =
  36. 36.91² =
  37. 37.19² =
  38. 38.31² =
  39. 39.29² =
  40. 40.91² =

Answer key

  1. 441
  2. 961
  3. 441
  4. 3721
  5. 4761
  6. 2401
  7. 841
  8. 2601
  9. 361
  10. 6241
  11. 961
  12. 4761
  13. 3481
  14. 441
  15. 3721
  16. 361
  17. 4761
  18. 441
  19. 841
  20. 961
  21. 1521
  22. 6241
  23. 7921
  24. 1681
  25. 441
  26. 8281
  27. 7921
  28. 4761
  29. 3481
  30. 3721
  31. 2401
  32. 8281
  33. 841
  34. 961
  35. 3721
  36. 8281
  37. 361
  38. 961
  39. 841
  40. 8281

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