Count to 120, starting at any number less than 120. In this range, read and write numerals and represent a number of objects with a written numeral.,Relate counting to addition and subtraction (e.g., by counting on 2 to add 2).,Count forward beginning from a given number within the known sequence (instead of having to begin at 1).,Given a two-digit number, mentally find 10 more or 10 less than the number, without having to count; explain the reasoning used.