[Grammar] Why is this wrong?

jei oh said:

I took the grammar test and the question was "rewrite the given sentence with multilplicative expression"

"Given sentence"

- It is only 3mm long, but it can jump about 30 cm.

and my answer was

- it can jump about 100 times of its body size.

Correct answer by teacher

- it can jump about 100 times its body size. (without 'of')

I understand people uses the correct answer. However, I don't understand why I am wrong grammatically.

Can you help me understand?

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emsr2d2 said:

Because we don't say "times of".

Nine is three times three.
A magic bottle can hold five times its own weight.
A flea can jump 150 times its own height.

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jei oh said:

As I mentioned above I understand people don't say "times of" when used after direct object, however, the teacher's answer used 'about' which makes 'jump' intransitive verb.... so that we have to use adverb clause right? in that case, I thought I could use one adverb clause and adjective clause that modifies '100 times.'

'about 100 times of its size'

If I'm worng, can you make it clear? thanks

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Tdol said:

I'd use about 100 times its body length. There's no need to say of.

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