Number and Operations: Whole Numbers Counting and the Number System At the beginning of the school year, students will count sets of objects by ones, write the number sequence, and explore and compare representations of the counting numbers on the number line and the 100 chart. As the school year progresses, most students will shift from thinking and working primarily with ones to thinking and working with groups of ones. To help them make this shift, students will develop strategies for grouping and for counting by groups. The focus is first on contexts that encourage counting by groups of 2, 5, or 10 and then specifically on groups of 10 and the base ten structure of our number system.
Benchmarks • Count a set of objects up to 100 in at least one way • Define even and odd numbers in terms of groups of two or two equal groups • Recognize and identify coins and their values • Interpret and solve problems about the number of tens and ones in a quantity • Know coin equivalencies for nickel, dime, and quarter • Count by 2s, 5s, and 10s, up to a number