Question: b) 85 - 45

Solution

To solve the problem \( b) \, 85 \cdot 45 \), follow these steps:

First, break down the multiplication using the distributive property:

\[ 85 \cdot 45 = (80 + 5) \cdot 45 \]

Distribute \(45\) to both \(80\) and \(5\):

\[ = 80 \cdot 45 + 5 \cdot 45 \]

Calculate each multiplication separately:

\[ 80 \cdot 45 = 3600 \]

\[ 5 \cdot 45 = 225 \]

Add the results together:

\[ 3600 + 225 = 3825 \]

Therefore, the solution is \( 3825 \).