Evaluate 7/9/3+2: animated lesson
A narrated, step-by-step order of operations video lesson with captions. Final answer: 61/27.
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 (0.4 MB) · Captions (WebVTT)
Steps on screen
- 1. The problemWorked example7/9/3+2
- 2. Steps, part 1
- Dividing by a fraction means multiplying by its reciprocal
- Multiply numerators and multiply denominators
- Rewrite both fractions with the least common denominator
- Add the numerators and keep the denominator
- 3. Steps, part 2
- Final answer in lowest terms
- 4. The answer
7/9/3+2 = 61/27
- 5. Check
- Decimal check: 61/27 ≈ 2.259259259
- As a mixed number: 2 7/27
Transcript
The problem. Here is the problem: 7 over 9/3 plus 2. Exact arithmetic with fractions (results kept in lowest terms).
Steps, part 1. Dividing by a fraction means multiplying by its reciprocal. Multiply numerators and multiply denominators. Rewrite both fractions with the least common denominator. The LCD of 27 and 1 is 27. Add the numerators and keep the denominator.
Steps, part 2. Final answer in lowest terms.
The answer. So the answer is 61 over 27. 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: 61 over 27 approximately 2.259259259. As a mixed number: 2 7 over 27.
About order of operations
Evaluate expressions with brackets, powers, multiplication, division, addition and subtraction in the right order.
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