Students explore addition problems with two 3 digit numbers and discover patterns that help find solutions and double check arithmetic answers.

**Grades covered:**3 through 8

**Curriculum Topics:**Addition, Number Patterns, Casting Out Nines

### Standards

**Categories include:**

- Grades 3-5
- Grades 6-8
- Math

**Tags:**Problem Solving, Addition & Subtraction

**Subjects covered:**["Math"]