I have recently posted two new topics in the "How To..." section of our website. One is related to place value and writing numbers, the other is an addition strategy.
There are times when students are asked to write a number in "expanded form." To do this, students need to break up a number into its place value parts.
One of the strategies students learn to help them add is to break the numbers up into their place value parts. This video explains the process so that you can better help your child.