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Squares Trick Worksheet

Speed calculation lesson 10: Squares next to a ten · Set 647 · 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. 1.81² =
  2. 2.21² =
  3. 3.49² =
  4. 4.39² =
  5. 5.19² =
  6. 6.51² =
  7. 7.81² =
  8. 8.29² =
  9. 9.61² =
  10. 10.31² =
  11. 11.79² =
  12. 12.79² =
  13. 13.39² =
  14. 14.91² =
  15. 15.59² =
  16. 16.29² =
  17. 17.51² =
  18. 18.19² =
  19. 19.61² =
  20. 20.21² =
  21. 21.71² =
  22. 22.81² =
  23. 23.49² =
  24. 24.69² =
  25. 25.79² =
  26. 26.79² =
  27. 27.29² =
  28. 28.19² =
  29. 29.39² =
  30. 30.89² =
  31. 31.51² =
  32. 32.81² =
  33. 33.49² =
  34. 34.59² =
  35. 35.29² =
  36. 36.19² =
  37. 37.41² =
  38. 38.41² =
  39. 39.81² =
  40. 40.79² =

Answer key

  1. 6561
  2. 441
  3. 2401
  4. 1521
  5. 361
  6. 2601
  7. 6561
  8. 841
  9. 3721
  10. 961
  11. 6241
  12. 6241
  13. 1521
  14. 8281
  15. 3481
  16. 841
  17. 2601
  18. 361
  19. 3721
  20. 441
  21. 5041
  22. 6561
  23. 2401
  24. 4761
  25. 6241
  26. 6241
  27. 841
  28. 361
  29. 1521
  30. 7921
  31. 2601
  32. 6561
  33. 2401
  34. 3481
  35. 841
  36. 361
  37. 1681
  38. 1681
  39. 6561
  40. 6241

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