Step by step
The question
Question: 3 + □ = 10.
What number goes in the box?
3 + □ = 10
1 Show 3
A ten frame has 10 boxes.
2 Fill the empty boxes
How many boxes are empty?
We fill them with blue dots.
We count them.
3 Write the number
7 blue dots fill the frame.
So 3 and 7 make 10.
3 + 7 = 10
4 Check
We count all the dots.
We start at 3 and count on.
4, 5, 6, 7, 8, 9, 10.
Yes!
It works.
3, 4, 5, 6, 7, 8, 9, 10
Let's look back.
First: show 3.
Then: fill the empty boxes.
Then: write the number.
Last: check.
Answer
3 + 7 = 10