# 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.