Unit 3, Lesson 20
Dividing a Decimal by a Decimal
Accelerated 6
Practice
Problem 2
Here is how Han found \(31.59 \div 13\):
Long division of 31 point 5 9 divided by 13. 8 rows. Top row: 2 point 4 3. Second row: 13, long division symbol with 31 point 5 9 inside. Third row: minus 26. Horizontal line. Fourth row: 55. Fifth row: minus 52. Horizontal line. Sixth row: 39. Seventh row: minus 39. Horizontal line. Eighth row: 0.
- At the second step, Han subtracts 52 from 55. How do you know that these numbers represent tenths?
- At the third step, Han subtracts 39 from 39. How do you know that these numbers represent hundredths?
- Check that Han’s answer is correct by calculating the product of 2.43 and 13.