Practice the questions of **McGraw Hill Math Grade 4 Answer Key PDF Chapter 13 Lesson 6 Problem Solving: Choosing a Method **to secure good marks & knowledge in the exams.

## McGraw-Hill Math Grade 4 Answer Key Chapter 13 Lesson 6 Problem Solving: Choosing a Method

**Solve.**

**Tell which method you chose for each problem. Explain why.**

Question 1.

Kameko and Bill have the same size water bottle. Kamekoâ€™s bottle is \(\frac{3}{10}\) full of water. Billâ€™s bottle is \(\frac{5}{10}\) full of water. How much more water does Billâ€™s bottle have?

Answer:

\(\frac{2}{10}\) more or \(\frac{1}{5}\) more; I used mental math. Itâ€™s easy to subtract \(\frac{3}{10}\) from \(\frac{5}{10}\) in your head.

Question 2.

A mechanic turns a bolt 89Â°. Then he turns it another 67Â°. How many degrees did he turn the bolt altogether?

Answer:

Explanation:

A mechanic turns a bolt 89Â°

Then he turns it another 67Â°

I used pencil and paper to find the sum

89 + 67 = 156

So, the mechanic turned the bolt 156Â° altogether.

Question 3.

A small office building has a rectangular parking lot. It measures 58 m long and 52 m wide. What is the perimeter of the parking lot?

Answer:

Explanation:

A small office building has a rectangular parking lot

It measures 58 m long and 52 m wide

I used pencil and paper to find the sum

perimeter of a rectangle = 2(l + w)

Length of the parking lot = 58 m

Width of the parking lot = 52 m

Perimeter = 2(58 + 52)

= 2 x 110 = 220

So, perimeter of the parking lot is 220 meters.