Explain, using the set of three bus images, that you first look at how many people are on the bus, then at how many people are waiting for the bus, and finally calculate how many people leave on the bus. You do this by counting all the people who already were in the bus, and adding that number to the number of people waiting for the bus. Ask students what the first number of the addition problem is, what the second number in the addition problem is, and what the sum is. Repeat that the sum is the total of the two numbers counted together.

Next practice two more exercises with the students in which they can count the people waiting for the bus in the images. Practice this with a few examples.

Finally show students that there are also bus examples where you can't count the people, but you are only given a number. Explain that you first count the number of people on the bus, and then add the number that is written at the bus stop. Those two numbers together make the sum, or total of people on the bus.

Check that students can add to 10 using the bus method by asking the following questions:

- What steps do you take to solve a bus problem?

- What total do you get if you have a bus with 2 people, and 2 more people get in?

- What total do you get if you have a bus with 3 people and 5 more people get in?