= 100÷ 2 7 ,

=350 (grams);

He ate about 350 grams of breakfast this morning.

(2)3. 14× ( 8 2 ) 2 ×9,

=3. 14× 16×9,

=50.24×9,

=452. 16 (cubic centimeter),

=452. 12 (ml);

Because 452. 12 < 498,

So this cup can't hold this bag of milk;

This cup can't hold this bag of milk.