Solve: 2(3 + ½×8) - Order of Operations with Mixed Numbers

Question

2(3+128)= 2\cdot(3+\frac{1}{2}\cdot8)=

Video Solution

Solution Steps

00:06 Let's solve this expression step by step.
00:10 First, focus on the parentheses. Always solve those first.
00:16 Next, remember to do multiplication and division before addition and subtraction.
00:22 Now, move the product to the top, into the numerator.
00:26 Let's calculate. Eight divided by two.
00:32 Keep using the order of operations to solve the rest.
00:38 And there you have it! That's the solution.

Step-by-Step Solution

Let's simplify this expression while following the order of operations which states that exponents come before multiplication and division, which come before addition and subtraction, and that parentheses come before all of these,

We will start by simplifying the expression in parentheses, since multiplication comes before addition, we will first perform the multiplication in the expression, while remembering that multiplying by a fraction means multiplying by the fraction's numerator, then we will perform the division of the fraction (by reducing it), we will complete simplifying the expression in parentheses by performing the addition within them:

2(3+128)=2(3+182)=2(3+)=2(3+4)=27 2\cdot(3+\frac{1}{2}\cdot8)= \\ 2\cdot(3+\frac{1\cdot8}{2})= \\ 2\cdot(3+\frac{\not{8}}{\not{2}})= \\ 2\cdot(3+4)= \\ 2\cdot7 \\ We will finish simplifying the given expression and perform the remaining multiplication:

27=14 2\cdot7= \\ 14 Therefore the correct answer is answer C.

Answer

14 14