There are some comic books on a shelf.
Mai puts 18 more on the shelf.
Now there are 47 in all.
How many comic books were on the shelf at first?

1. Draw a diagram representing the comic books.
2. How many comic books are on the shelf now? Show your thinking using drawings, numbers, or words.

There are 83 people on the stairs. 47 of them go up, and some come down.

1. Why does the tape diagram match the story?

   

2. How many people come down the stairs? Explain or show your reasoning.

Lin reads 25 pages of a book. Clare is reading the same book. Lin reads 19 fewer pages of the book than Clare. How many pages did Clare read?

1. Draw a diagram to represent the pages Lin and Clare read.
2. Write an equation. Use a ? for the unknown value.
3. Solve the problem. Explain your reasoning.

1. 42 people swim in a lake. Then 25 more people go in to swim. How many people swim in all?
2. 18 more people go into the lake to swim. How many people swim now?

Here is a tape diagram.

1. Write a story problem this tape diagram could represent.
2. Label the tape diagram to match your story.
3. Solve your story problem.

1. Write a story problem this tape diagram could represent.

   

2. Fill in the tape diagram with the information from your story.
3. Solve your story problem.