When we round a number to the tens place we look to our ones place to tell us if we round up or down. If the number in our ones place is or greater, we round up. If the number in the ones place is or less, we round down. When we round up, the number in the tens place increases by . The numbers to the right of the tens place become and the numbers to the left of the tens place stay the same. When we round down, the number in the tens place stays the same. The numbers to the right of the tens place become and the numbers to the left of the tens place stay the same.

In this case, is less than so our rounded number is

The circle is split up into equal parts. of the parts are shaded green, which means of the circle is green.

The fraction models below show and

is greater than because more of the model is filled in.