**Addition Vocabulary: Please help your child to be able to read the word, spell the word, know the definition, and use the word in a sentence.**

- sum - the answer when adding two or more addends
- pattern - an ordered set of numbers or objects in which the order helps you predict what will come next
- commutative (order) property of addition - The property that states that you can add two or more numbers in any order and get the same sum
- associative (grouping) property of addition - The property that states that you can group addends in different ways and still get the same sum
- identity (zero) property of addition - The property that states that when you add zero to a number, the result is that number
- round - to replace a number with another number that tells about how many or how much
- estimate - to find about how many, or how much
- compatible numbers - numbers that are easy to compute mentally
__EXTRA WORDS__- addends - numbers added together to give a sum