# Lesson 10

Using Long Division

Let’s use long division.

### Problem 1

Kiran is using long division to find $$696 \div 12$$. He starts by dividing 69 by 12. In which decimal place should Kiran place the first digit of the quotient (5)?

A:

Hundreds

B:

Tens

C:

Ones

D:

Tenths

### Problem 2

Here is a long-division calculation of $$917 \div 7$$. 1. There is a 7 under the 9 of 917. What does this 7 represent?
2. What does the subtraction of 7 from 9 mean?
3. Why is a 1 written next to the 2 from $$9-7$$?

### Problem 3

Han's calculation of $$972 \div 9$$ is shown here. 1. Find $$180 \boldcdot 9$$.
2. Use your calculation of $$180 \boldcdot 9$$ to explain how you know Han has made a mistake.
3. Identify and correct Han’s mistake.

### Problem 4

Find each quotient. ### Problem 5

One ounce of a yogurt contains of 1.2 grams of sugar. How many grams of sugar are in 14.25 ounces of yogurt?

A:

0.171 grams

B:

1.71 grams

C:

17.1 grams

D:

171 grams

(From Unit 5, Lesson 7.)

### Problem 6

The mass of one coin is 16.718 grams. The mass of a second coin is 27.22 grams. How much greater is the mass of the second coin than the first? Show your reasoning.

(From Unit 5, Lesson 4.)