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Order of operationsArithmeticElementary schoolabout 0:34

Evaluate 15 + 6 / 2 + 12: animated lesson

A narrated, step-by-step order of operations video lesson with captions. Final answer: 30.

SpeedLanguage

Video with a synthetic English voice and captions. Pick another language for subtitles in that language, or open the interactive version.

Video narrated by a synthetic voice (Piper TTS, en_US-ljspeech-high voice (LJ Speech dataset, public domain)); the steps come from our maths engine and the answer was checked independently. Download MP4 (0.2 MB) · Captions (WebVTT)

Steps on screen

1. The problem
Worked example
15 + 6 / 2 + 12
2. Step by step
1. $15 + 3 = 18$
  Add the whole numbers
2. $18 + 12 = 30$
  Add the whole numbers
3. $30$
  Final answer in lowest terms
3. The answer
$30$
15 + 6 / 2 + 12 = 30
4. Check
- Decimal check: 30 ≈ 30

Transcript

The problem. Here is the problem: 15 plus 6 over 2 plus 12. Exact arithmetic with fractions (results kept in lowest terms).

Step by step. Add the whole numbers. Add the whole numbers. Final answer in lowest terms.

The answer. So the answer is 30. Fractions are combined over a common denominator for addition and subtraction, multiplied straight across, and divided by multiplying by the reciprocal. The result is reduced by the greatest common factor.

Check. Decimal check: 30 approximately 30.

About order of operations

Evaluate expressions with brackets, powers, multiplication, division, addition and subtraction in the right order.

Evaluate 15 + 6 / 2 + 12: Animated Step-by-Step Lesson