# 1.6 Length Measurements Within 120 Units

## Unit Goals

- Students measure length and count up to 120 length units. They solve addition and subtraction story problems with unknowns in all positions.

### Section A Goals

- Compare the lengths of objects indirectly.
- Order objects by length.

### Section B Goals

- Count groups of up to 120 objects and write a number to represent them.
- Lay length units end-to-end with no gaps or overlaps and count the units to determine length.

### Section C Goals

- Solve addition and subtraction story problems with unknowns in all positions.

### Glossary Entries

**category**A label that tells how objects in a group are alike.**data**Information about the things or people in a group.

Example: If you have a box of colored pencils, then the lengths and colors of each of the pencils are data about the pencils in the box.**difference**The result when one number is subtracted from another.**estimate**To find a value that is close to the correct value.

**greater than**63 is greater than 32.

63 > 32**length**The measure of how long an object is in same-size units with no gaps or overlaps.

Example: The length of this sneaker is 15 cubes long.

**less than**32 is less than 63.

32 < 63**sum**The total when two or more numbers are added.**survey**A way to collect data using a group of people answering the same question.**teen number**A number with 1 ten and between 1 and 9 ones.

Example:

Fifteen is 1 ten and 5 ones.**two-digit number**