2.OA.3 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. Odd and Even Odd and Even II Odd and Even Quiz Odd and Even Game

2.MD.6 Represent whole numbers as lengths from 0 on a number line diagram with equally spaced points and represent whole-number sums and differences within 100 on a number line Subtraction on a Number Line IXL Number Lines