### Home > CC1 > Chapter 5 > Lesson 5.3.4 > Problem5-105

5-105.

Simplify each of the following expressions without using a calculator. Then use a calculator to check your answers. Homework Help ✎

1. $0.045 + 1.2 + 62.003$

Make sure you add parts that are alike. You can think of 0.045 as

$\frac{4}{100}\text{ and } \frac{5}{1000}\text{ or as }\frac{45}{1000}.$

How can you combine this with the other numbers? Be sure to show your work.

2. $56.7 − 0.23$

$\text{You can think of 56.7 as } 56\frac{7}{10}\text{ and 0.23 as } \frac{23}{100}.$

How can you subtract $23$ hundredths from $70$ hundredths?

3. (7.8)(0.03)

$0.234$

4. $6.3 − 7.5$

Since $7.5$ is greater than $6.3$, your answer should be less than zero.

$−1.2$