学生用书第41-42 页

If seven is one more than six,

eleven more is seventeen than six.

If we add the red blocks and blue blocks,

we  have  twelve blocks in total.

The number sentence is 16-4=12

Sixteen minus four equals twelve.

There are six more yellow candles 

than green candles.

If there are twenty green candles 

on the first shelf

and six yellow candles 

on the second shelf,

there are fourteen more green candles

than yellow candles.