Addition Facts to 20 (Stacked)
Add. Write your answer in the blue boxes.
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This is sheet #10724601.
How to do it
- Look at the top number.
- Add the bottom number.
- Write the answer in the blue box.
Teaching tip
Short and often beats long and rare. One sheet a day builds speed. This sheet is aligned with Common Core 1.OA.C.6.
About this worksheet
Sixteen addition facts with sums up to 20, written top to bottom like they are in later grades.
What kids practice
Addition within 20 means putting two groups together when the total is 20 or less. In first grade, kids move from counting every object to faster tricks like counting on, doubles and making ten. Those tricks are what make the bigger facts like 8 + 6 feel easy.
Watch for
- Counting the first number again when counting on, so 8 + 3 becomes 10 instead of 11.
- Counting everything from 1 every time, which is slow and leads to mistakes.
- Forgetting that order does not matter. 2 + 9 is the same as 9 + 2, so start with the bigger number.
It's free to print, with Fewer, Standard or More on the page and an answer key. See the full addition within 20 guide for 1st grade.
More sheets in this set
- See it all
1. Addition TableEvery addition fact from 0 + 0 to 10 + 10, with doubles and make-10 facts colored. - See it all
2. Addition Strategies ChartFour ways to add: count on, make a 10, doubles and near doubles, each with a picture. 
3. Count Them AllTwo small picture groups for each problem. Count each group, then put them together.
4. Make 10 with Ten FramesTwo ten frames for each problem. Filling the first frame shows that 8 + 5 is the same as 10 + 3.
5. Count On with a Number LineA 0 to 20 number line for each problem. The first two rows show the hops as examples.
6. Doubles and Near DoublesEight doubles facts, then six near doubles with a hint that shows the double to start from.
7. Make Ten to AddSplit the second addend into two boxes to make a 10, then finish the problem as 10 plus something.
9. Addition Facts to 20 (In a Row)Sixteen addition facts with sums up to 20, written across the page.