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Squares Trick Worksheet

Speed calculation lesson 10: Squares next to a ten · Set 807 · 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. 1.39² =
  2. 2.91² =
  3. 3.89² =
  4. 4.21² =
  5. 5.69² =
  6. 6.91² =
  7. 7.61² =
  8. 8.41² =
  9. 9.81² =
  10. 10.61² =
  11. 11.19² =
  12. 12.29² =
  13. 13.91² =
  14. 14.49² =
  15. 15.51² =
  16. 16.21² =
  17. 17.79² =
  18. 18.51² =
  19. 19.19² =
  20. 20.69² =
  21. 21.31² =
  22. 22.49² =
  23. 23.79² =
  24. 24.79² =
  25. 25.31² =
  26. 26.29² =
  27. 27.19² =
  28. 28.79² =
  29. 29.39² =
  30. 30.79² =
  31. 31.29² =
  32. 32.51² =
  33. 33.39² =
  34. 34.41² =
  35. 35.51² =
  36. 36.39² =
  37. 37.79² =
  38. 38.19² =
  39. 39.59² =
  40. 40.79² =

Answer key

  1. 1521
  2. 8281
  3. 7921
  4. 441
  5. 4761
  6. 8281
  7. 3721
  8. 1681
  9. 6561
  10. 3721
  11. 361
  12. 841
  13. 8281
  14. 2401
  15. 2601
  16. 441
  17. 6241
  18. 2601
  19. 361
  20. 4761
  21. 961
  22. 2401
  23. 6241
  24. 6241
  25. 961
  26. 841
  27. 361
  28. 6241
  29. 1521
  30. 6241
  31. 841
  32. 2601
  33. 1521
  34. 1681
  35. 2601
  36. 1521
  37. 6241
  38. 361
  39. 3481
  40. 6241

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