A baker is going to make 24 blueberry pies. She wants to make sure each...

Step 1
Since baker wants that each pie contains 3.5 cups of blueberries, to calculate how many cups will she need if sshe is going to make 24 pies, we have to find the next prodduct:
${\displaystyle 24\times 3.5=?}$
1) Multiply these numbers as if they were both whole numbers, ignoring the decimal point
$$\begin{array}{cccc}& & 2& 4\\ \times & & 3.& 5\\ & 1& 2& 0& \to & 1& \text{partial product,}& 24\times 5\\ & 7& 2& 0& \to & 2& \text{partial product,}& 24\times 3\end{array}$$
2) Add partial products
$$\begin{array}{cccc}& & 2& 4\\ \times & & 3.& 5\\ & 1& 2& 0\\ +& 7& 2& 0\\ & 8& 4& 0\end{array}$$
3) Compensate by placing the decimal point in the product
$$\begin{array}{cccc}& & 2& 4\\ \times & & 3.& 5& \to & \text{one decimal digit}\\ & 1& 2& 0\\ +& 7& 2& 0\\ & 8& 4& 0& \to & \text{one decimal digit}\end{array}$$
Therefore,
${\displaystyle 24\times 3.5=84}$
The baker will need 84 cups of blueberries.

Step 1
${\displaystyle 1\text{pie}=3.5\text{cups of blueberries}}$
${\displaystyle 24\text{pies}=?\text{blueberries}}$
Since you already know how many blueberries are needed for one pie, now to find how many blueberries are needed for 24 pies, multiply 24 by 3.5:
${\displaystyle 24\cdot 3.5=84}$

Step 1 The baker wants to make 24 blueberry pies. Since, 1 pie needs 3.5 cups of blueberries, She will need, $24\times 3.5$ cups Answer: $\Rightarrow 84$ cups.