Partition circles and rectangles into two and four equal shares, describe the shares using the words halves, fourths, and quarters, and use the phrases half of, fourth of, and quarter of.

Describe the whole as two of, or four of the shares. Understand for these examples that decomposing into more equal shares creates smaller shares.

Given a two-digit number, mentally find 10 more or 10 less than the number, without having to
count; explain the reasoning used.

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

Use addition and subtraction within 20 to solve word problems involving situations of adding to, taking from, putting together, taking apart, and comparing, with unknowns in all positions. (e.g., by using objects, drawings, and equations with a symbol for the unknown number to represent the problem)

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.