Missing Numbers to 20
Find the missing number. Write it in the blue squares.
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This is sheet #40124601.
How to do it
- Read the whole problem first.
- Find the blue squares. That is the missing number.
- Check by putting your number in and reading it again.
Teaching tip
Read it with the word "what" for the blank: what minus 6 is 8? This sheet is aligned with Common Core 2.OA.B.2.
About this worksheet
Addition and subtraction facts with the missing number in any spot, like ? - 6 = 8.
What kids practice
By the end of second grade, kids should know every addition fact up to 9 + 9 without counting, and subtract within 20 quickly. In first grade they learned the facts one kind at a time. Now the facts are mixed, so the first job is to read the sign, and the second is to pick a fast way to solve it.
Watch for
- Adding when the sign says subtract, especially after a row of addition problems.
- Counting on fingers for facts they already know. Ask "do you know this one by heart?" first.
- In take back to 10, taking away the whole bottom number from the teen number in one step and losing track.
It's free to print, with Fewer, Standard or More on the page and an answer key. See the full addition and subtraction facts to 20 guide for 2nd grade.
More sheets in this set
- See it all
1. Fact Strategies ChartFive ways to solve a fact you don't know yet, with an example for each. 
2. Plus or Minus?Addition and subtraction facts mixed together on graph paper, so kids have to read the sign.
3. Plus or Minus? (In a Row)The same mixed facts written in a line, the way they look in story problems and on tests.
4. Take Back to 10Teen subtraction facts broken into two easy steps, through 10.
5. Fact SprintA full page of mixed facts and a score box for a 3-minute timed practice.