Look at the 2 rows of stickers in part A. How can you find out how many stickers there are?
Count by ones.
Does it matter which sticker you start with when you count? Why or why not?
It does not matter. The number of stickers does not change.
Now count the stickers by ones. How many stickers are there in all?
There are 18 stickers in all. (Count by ones: 1, 2, 3, . . . 18.)
Look at part B. How many cars are there? How do you know?
There are 12 cars. The last number represents the total number of cars.
Look at the set of numbers shown in part C. What are the missing numbers?
99 and 100.
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