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Squares Trick Worksheet

Speed calculation lesson 10: Squares next to a ten · Set 209 · 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. 1.29² =
  2. 2.39² =
  3. 3.51² =
  4. 4.29² =
  5. 5.51² =
  6. 6.91² =
  7. 7.21² =
  8. 8.79² =
  9. 9.19² =
  10. 10.19² =
  11. 11.31² =
  12. 12.91² =
  13. 13.49² =
  14. 14.79² =
  15. 15.79² =
  16. 16.61² =
  17. 17.49² =
  18. 18.81² =
  19. 19.69² =
  20. 20.31² =
  21. 21.31² =
  22. 22.51² =
  23. 23.59² =
  24. 24.41² =
  25. 25.19² =
  26. 26.21² =
  27. 27.29² =
  28. 28.31² =
  29. 29.29² =
  30. 30.79² =
  31. 31.69² =
  32. 32.91² =
  33. 33.19² =
  34. 34.29² =
  35. 35.79² =
  36. 36.81² =
  37. 37.91² =
  38. 38.59² =
  39. 39.29² =
  40. 40.21² =

Answer key

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

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