Mathematical Calculations for Task 1?

Consider the following IELTS Task 1 question:

Now, read part of a student's response:
What's wrong here?
The problem is the mathematical calculation used. If you make complicated mathematical calculations in your IELTS Task 1 answer, you'll scare the examiner away
.
Avoid (complicated) mathematical calculations. In general, the following words are suitable for making comparisons:

Now, read part of a student's response:
On the other hand, Asia which consumes 26.21% of oil resources contributes only about one ninth of this total.
What's wrong here?
The problem is the mathematical calculation used. If you make complicated mathematical calculations in your IELTS Task 1 answer, you'll scare the examiner away

Avoid (complicated) mathematical calculations. In general, the following words are suitable for making comparisons:
- double
- twofold
- twice
- three/four/five times
- half
- much more
- dramatically more/less
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