Addition is the process of combining groups. If I have 1 paper clip and I add 6 more, how many total do I have?

I started with 1 paper clip.

Then I added 6 more.

When I put them together, I counted 1, 2, 3, 4, 5, 6, 7 total.

So, the sum of 1 + 6 is 7. 1 + 6 = 7 is the number sentence that describes how I combined the paper clips.

Addend = a number to be added to another number

Sum = the result of addition