ALP Math
Index Assessments Lessons Vocabulary Rubrics Home
Federal Way Public Schools  
Number Sense
Lesson 3		 Understanding Operations on Numbers
  Objectives/Vocab/Tips > Examples 1 | 2 | 3 | 4 > Practice: 1 | 2 | 3 | 4 | 5 > Reflection

Example 4:

Solve the following mathematical sentence:

39 - 2 x 9 + (18 3) - 4 x (2+1)

  1. 26
  2. 3
  3. 10
  4. 48

One way of solving this sentence is the following:

Step 1: According to the Order of Operations, we take care of parenthesis first.

39 - 2 x 9 + 6 - 4 x 3

Step 2: Next, we take care of multiplication.

39 - 18 + 6 - 12

Step 3: Addition is next.

39 - 24 - 12

Step 4: Finish up with the subtraction.
  • 15 - 12
    3
Our final answer is 3 which is letter B.

 

©Internet Academy