1. 蛋糕分成三份吧。

[ dàn gāo fēn chéng sān fèn bā 。 ]

Let's divide the cake into three.

2. 他的蛋糕是我的四倍大。

[ tā de dàn gāo shì wǒ de sì bèi dà 。 ]

His cake is four times as big as mine.

3. 他的蛋糕比我的大三倍。

[ tā de dàn gāo bǐ wǒ de dà sān bèi 。 ]

His cake is three times bigger than mine.

4. 这是目前世界上最大的蛋糕了。

[ zhè shì mù qián shì jiè shàng zuì dà de dàn gāo le 。 ]

This is by far the largest cake in the world.