Jake completed a cube puzzle in 8.352 minutes. What is the number written in expanded notation?

First you need to be able to identify what place each number is in.

The 8 is the whole number, so the ones place. The 3 in the tenths. The 5 in the hundredths. The 2 in the thousandths.

Now, you can expand.

(8 +.3 +.05 +.002)

Because we identified what place each number was in, when we expanded the number, we knew where to put the number and to fill in the empty places with zeros.

I hope you understand it the way I tried to explain!