Fernando is buying several boxes of cookies for a birthday party. There are 9 cookies in each box. If she brings 7 boxes to the party, the number of cookies he is bringing is?

The correct answer is: 63

Each box has 9 cookies.
7 boxes have 9 × 7 = 63
He brings 63 cookies.

number of cookies in 1 box = 9
number of boxes of cookies = 7
number of cookies in 7 boxes = 9 x 7 = 63 cookies
this is a simple multiplication problem. apply the unitary method to get the result.
This method says that if we know the value of an entity corresponding to a certain value, we can find the value of the same entity corresponding to the multiple of the same value.