Dylan ate 0.4 of the his brother ate 3/10 of the pie Who ate more

.4 is bigger than .3

To determine who ate more, we need to compare the quantities that Dylan and his brother ate. Dylan ate 0.4 of the pie, while his brother ate 3/10 of the pie.

To compare these fractions, we can convert them to a common denominator. The least common denominator for 10 and 5 is 10.

Converting Dylan's fraction to a denominator of 10, we get:
0.4 * 10 = 4

Converting his brother's fraction to a denominator of 10, we get:
3/10 * 10 = 3

Now we can compare 4 and 3. Since 4 is greater than 3, Dylan ate more of the pie than his brother.