**add**: when you add, you join groups together

**addition sentence**: 3+4=7 or three plus four equals seven

**part**: each group of the counters is a part. The 2 parts together make a whole.

**equals**: "is the same"

**sum**: the amount in all after you add

**plus**: added to

**join**: put together

**whole**: add 2 parts to make the whole

**minus:**to take away or subtract

**difference**: the amount that is left after you subtract

**subtraction sentence**: 9-3=6 or nine minus three equals six

**subtract:**when you subtract, you find out how many are left or which group has more

**fewer**: use fewer to talk about having a lesser amount

**separate**: to separate can mean to subtract

**more**: the group with a greater number of objects has more

**related**: addition facts and subtraction facts are related if they have the same numbers.

**doubles**: addition facts in which the two numbers being added are the same

**addend:**the numbers that are added are called the addends

**number sentence**: a mathematical sentence with an operational symbol and an equal sign.

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