Order of operations (PEMDAS)
Lesson 8 of 20 in Union Aptitude Prep. The start plays free here.
- Several operations in one formula
- An order for the calculations
- A value to find
- A = B + 3(4 − C)
- A = 5 + 3(4 − 2)
- A = 5 + 3 × 2
- A = 5 + 6
- A = 11
- Number series trainer
- Algebra & functions with worked steps
- Reading comprehension sets
Paid once, no subscription. Ask for a refund within 7 days of buying if you’ve done less than 25% of the class.
How the lesson starts
You face a formula with several operations. Order of operations tells you which calculation comes next, so you can find the value the question asks for.
The sample question gives you B equals 5 and C equals 2. Substitute those values: put 5 where B was and 2 where C was.
Then, in the full lesson
- Inside first
- Multiply next
- Equal priority
- Finish the formula
- 2 questions along the way
A question from this lesson
You see 8 − (3 − (2 − 1)). Which subtraction do you do first?
- 3 − 2
- 8 − 3
- 2 − 1
Show the answer
C. 2 − 1. 2 − 1 is inside the innermost parentheses. Starting with 8 − 3 skips both grouping levels. Starting with 3 − 2 skips the innermost group.
The full class, $39 once.
Paid once, no subscription. Ask for a refund within 7 days of buying if you’ve done less than 25% of the class.
- Number series trainer
- Algebra & functions with worked steps
- Reading comprehension sets
Not affiliated with IBEW, NECA, ETA or any JATC. Original practice questions only.