## Lesson: Comparing and Ordering Integers and Decimals

Developing the Concept

Now that students have created their own number lines and acquired an initial understanding of ordering and comparing decimals, they can expand their understanding by comparing and ordering integers.

**Materials:** your model number line and the number line students completed from the first lesson; large model of a number line from 0 to ^{−}5; blank number line with write-on lines, for each student (see below)

**Preparation:** Post your model number line from 0 to 5 where students can see it. Construct a model number line from 0 to ^{−}5. Prepare student number lines with write-on lines. Use Learning Tool 5 in the *Learning Tools Folder.*

**Wrap-Up and Assessment Hints**

Create several true-or-false statements and have students use their number lines to tell you whether a statement is true or false. If the statement is false, have students rewrite it to make a true statement.

^{+}2.3 > ^{−}2.3 (True)

^{−}1.8 > ^{+}0.9 (False; ^{+}0.9 > ^{−}1.8 or ^{−}1.8 < ^{+}0.9)

Zero is an integer. (True)

The number ^{−}8 is to the left of 150 on a number line. (True)

Negative 3 can be written as 3 or ^{−}3. (False; negative 3 can only be written as ^{−}3; positive 3 can be written as 3 or ^{+}3.)

The numbers ^{−}2.4 and ^{+}2.4 are opposites of each other. (True)

All positive numbers are to the left of zero on a number line. (False; all positive numbers are to the right of zero on a number line; all negative numbers are to the left of zero on a number line.)