## Standards derived from the same national standard

Use concrete objects to determine whether a group of up to 20 objects is even or odd.

Determine whether a group of objects (up to 20) has an odd or even number of members, e.g., by pairing objects or counting them by 2s; write an equation to express an even number as a sum of two equal addends.

Determine whether a group of objects (up to 20) has an odd or even number of members, e.g., by pairing objects or counting them by 2s; write an equation to express an even number as a sum of two equal addends.

Writing an equation to express an even number as a sum of two equal addends.

Determine whether a group of objects (up to 20) has an odd or even number of members, e.g., by pairing objects or counting them by 2s; write an equation to express an even number as a sum of two equal addends.

Determine whether a group (up to 20) has an odd or even number of objects (i.e., by pairing objects or counting them by 2s).