Count, compare and represent whole numbers up to 120, with an emphasis on groups of tens and ones.

Benchmarks1. Use place value to describe whole numbers between 10 and 100 in terms of tens and ones.

ExamplesRecognize the numbers 21 to 29 as 2 tens and a particular number of ones.

2. Read, write and represent whole numbers up to 120. Representations may include numerals, addition and subtraction, pictures, tally marks, number lines and manipulatives, such as bundles of sticks and base 10 blocks.

3. Count, with and without objects, forward and backward from any given number up to 120.

4. Find a number that is 10 more or 10 less than a given number.

Using a hundred grid, find the number that is 10 more than 27.
5. Compare and order whole numbers up to 120.

6. Use words to describe the relative size of numbers.

Use the words equal to, not equal to, more than, less than, fewer than, is about, and is nearly to describe numbers.
7. Use counting and comparison skills to create and analyze bar graphs and tally charts.

Make a bar graph of students' birthday months and count to compare the number in each month.
Use a variety of models and strategies to solve addition and subtraction problems in real-world and mathematical contexts.
1. Use words, pictures, objects, length-based models (connecting cubes), numerals and number lines to model and solve addition and subtraction problems in part-part-total, adding to, taking away from and comparing situations.

2. Compose and decompose numbers up to 12 with an emphasis on making ten.

Given 3 blocks, 7 more blocks are needed to make 10.
3. Recognize the relationship between counting and addition and subtraction. Skip count by 2s, 5s, and 10s.