Practice the questions of **McGraw Hill Math Grade 4 Answer Key PDF Chapter 10 Lesson 8 Problem Solving: Working Backward **to secure good marks & knowledge in the exams.

## McGraw-Hill Math Grade 4 Answer Key Chapter 10 Lesson 8 Problem Solving: Working Backward

**Solve**

Question 1.

The owner of a gift stop has a large spool of wrapping paper. She uses 13\(\frac{2}{5}\) yards of paper in one week and 16\(\frac{1}{5}\) yards of paper the next week. She has 41\(\frac{1}{5}\) yards of paper left over. How many yards of wrapping paper did she start with?

Answer:

70\(\frac{4}{5}\)

Explanation:

The owner of a gift stop has a large spool of wrapping paper

She uses 13\(\frac{2}{5}\) yards of paper in one week

16\(\frac{1}{5}\) yards of paper the next week

She has 41\(\frac{1}{5}\) yards of paper left over

Add to find

13\(\frac{2}{5}\) + 16\(\frac{1}{5}\) + 41\(\frac{1}{5}\) = 70\(\frac{4}{5}\)

The owner of a gift shop has 70\(\frac{4}{5}\) yards of wrapping paper she started with.

Question 2.

Toshi drove from home to work. Then he drove from work to Beth s house. He drove 13\(\frac{1}{4}\) miles south, then 29 miles east, then another 8\(\frac{1}{4}\) miles south. He drove a total of 55\(\frac{3}{4}\) miles for the entire day. How many miles did he drive from home to work?

Answer:

70\(\frac{4}{5}\)

Explanation:

Toshi drove from home to work

Then he drove from work to Beth s house

He drove 13\(\frac{1}{4}\) miles south

Then 29 miles east

Then another 8\(\frac{1}{4}\) miles south

13\(\frac{1}{4}\) + 29 + 8\(\frac{1}{4}\) = 50\(\frac{2}{4}\)

He drove a total of 55\(\frac{3}{4}\) miles for the entire day

55\(\frac{3}{4}\) – 50\(\frac{2}{4}\) = 5\(\frac{1}{4}\)

So, Toshi drove 5\(\frac{1}{4}\) miles from home to work.