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

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

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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.

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