lesson
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Imagine you have a box of ten delicious donuts, but they come in three tasty flavors: strawberry, blueberry, and lemon.
How many of each flavor do you need so they fill the box of ten completely?
Building Ten with Three Parts
Each number we add together is called an addend.
We can put three addends together on a ten-frame to build a total sum of ten.
📊Interactive diagram
What is the easiest way to add three numbers together without getting confused?
Add Two, Then Add the Last One
To add three numbers like 4+2+4, we start by adding the first two numbers together.
First, 4+2=6. Then we add the last number: 6+4=10!
📊Interactive diagram
Does it matter which two numbers you add first?