Videos and songs to help Grade 1 kids learn how to determine the unknown whole number in an addition or subtraction equation relating three whole numbers.

*For example, determine the unknown number that makes the equation true in each of the equations 8 + ? = 11, 5 = _ – 3, 6 + 6 = _*.

Common Core: 1.OA.8

### Learning Targets:

- I can determine the unknown value in an addition or subtraction equation when two out of three numbers in the equation are given.

Related Topics:

More Lessons for Grade 1,

Common Core for Grade 1
The Mystery of the Missing Addends

A fun story to help kids learn how to find missing addends using part part whole

3 + ? = 7

Solving addition and subtraction fact families when all three numbers are given and when there is a missing number.

Missing addends

4 + ? = 7

? + 5 = 7

Missing Addend using Tens Frame

Using the tens frame to solve missing addend problems.

Find the Missing Number (1.OA.8).

Subtraction and Missing Addend

I have 5 pencils. Josh has 2 pencils.
How many more pencils does Josh need to have the same number of pencils as me?

An item costs $7. I have $3. How many more dollars do I need to but the item?

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