# 1.4 Numbers to 99

## Unit Goals

- Students develop an understanding of place value for numbers up to 99.

### Section A Goals

- Add and subtract multiples of 10.
- Represent the base-ten structure of multiples of 10 up to 90 using towers of 10, drawings, numbers, or words.

### Section B Goals

- Add and subtract multiples of 10.
- Represent the base-ten structure of numbers up to 99 using drawings, numbers, and words.
- Understand that the two digits of a two-digit number represent amounts of tens and ones.

### Section C Goals

- Compare 2 two-digit numbers based on the values of the tens and ones digits, recording the results of comparisons with the symbols >, =, and <.>

### Section D Goals

- Represent two-digit numbers in different ways, using different amounts of tens and ones.