## Unit Goals

• Students use place value understanding and properties of operations to add within 100.

### Section A Goals

• Add within 100 without composing a ten.
• Use equations to represent addition methods.

### Section B Goals

• Add a one-digit and a two-digit number within 100 with composing a ten.
• Use equations to represent addition methods.

### Section C Goals

• Add 2 two-digit numbers within 100, with composing a ten.
• Use equations to represent addition methods.

### 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

• 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