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Number Sense
Lesson 4
Computation
  Objectives/Vocab/Tips > Examples 1 | 2 | 3 | 4 | 5 > Practice: 1 | 2 | 3 | 4 | 5 > Reflection

Example 2:

A certain stock sells for 18 3/5 dollars per share. How much would 50 shares cost?

  1. $900
  2. $925
  3. $930
  4. $950

To solve this problem we would:

Step 1: Understand the problem. We need to find out what 50 shares of stock would cost at 18 3/5 dollars.

Step 2: Analyze the data. 50 shares of stock at 18 3/5 dollars.

Step 3: Plan. We can choose our operation for this one to be multiplication of 50 times 18 3/5.

Step 4: Estimate. To estimate an answer we would round 18 3/5 to $20 and then multiply 50 times 20 for an estimated answer of $1000.

Step 5: Solve the problem. The first thing we would do is change our mixed number, 18 3/5, to an improper fraction.

18 3/5 = 93/5

Now we multiply 50 x 93/5.

From here you can take one of two paths to your answer. The first path is a little longer, but works just fine. Multiply 50 times 93 and then divide by the 5 in the denominator.

50 x 93/5 = 4650/5 = 930

The shorter path is to notice that you can divide out by reducing the 50 and the 5 in the denominator. So our work looks like this:

50 x 93/5 = 10 x 93 = 930

Notice we get the same answer, but reached it a little differently both ways.

Step 6: Examine our answer. We find that 50 shares of the stock would cost $930. This is also close to our estimate as well.

Therefore, our final answer would be C, $930.

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