Write a story problem for the addition sentence 7+__=9. Solve the story problem.

Story:

Karina had 7 notebooks. He sister left for her some more notebooks, but Karina did not check how many.

Later she counted, and she had 9 notebooks.

How many notebooks did her sister leave for her?

and the solution:

7+x=9

we subtract 7 from both sides:

7-7+x=9-7

now we calculate what we can:

x=2

so the solution is: she left two notebooks.

If K. C. has 7 tablets and her mom and dad get her sister, liz, 2 tablets how many tablets would her and her sister have?

7 + = 9 9-7 = 2

9 is the whole

7 is how many K. C. has

2 is how many liz has