Third number is the charm: adding three numbers

Good things come in threes, especially at the aquarium! Join Mia today as we learn to add three numbers together to find the total. Mostly, we've learned to add two numbers together, like 2+3, but today we are working with three charming numbers, like this: 2+3+5. Use some of the math strategies we've learned to help out, its as easy as 1-2-3!

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Standards addressed

CCSS.MATH.CONTENT.1.NBT.C.4

Add within 100, including adding a two-digit number and a one-digit number, and adding a two-digit number and a multiple of 10, using concrete models or drawings and strategies based on place value, properties of operations, and/or the relationship between addition and subtraction; relate the strategy to a written method and explain the reasoning used. Understand that in adding two-digit numbers, one adds tens and tens, ones and ones; and sometimes it is necessary to compose a ten.

Third number is the charm: adding three numbers

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Addition and Subtraction - 1st grade