Times
Fold
noun, suffix
Throw this onto a number and you have yourself the number of times something has increased. For example, ３倍 means something increased "three fold."
The reading is the same as the one you learned with the kanji. Omit the 〜 when writing out the answer, though. That just represents that there should be something before the kanji in this word when being used.
二倍
twofold
三倍
threefold
一倍
onefold
年末までに売り上げを去年の五倍にしたいんです。
I want to increase sales by five times before the end of the year.
このお金、最低でも七倍にして返してよね。
Make it at least seven times more before you give me back this money.
回転寿司の普及に伴い、日本におけるサーモンの消費量は輸入開始から三倍となった。
Since the introduction and subsequent spread of conveyer belt sushi shops, salmon consumption in Japan has tripled.