I have been working on teaching my students to add money (the Singapore way). Because we spent so much time using the place value mats, I decided that it may help with their transfer to add money using the place value mats with a decimal. I began by just showing the students coin combinations in my SMART notebook file. They have to recognize coins and find the sum of each circle combination. Then I have them record the amount on the money adding page recording sheet. Once all the students have their answers recorded on their sheet, I select a student to come up and "uncover" the mystery amount. This allowed me to see who understands the idea of coins, dollars and the placement of the decimal. After that, I had my students write the sums of two coin combinations into the place value boards and find the total amount of money for both coin combinations. I like to remind them that when the sum is ten or more (in each place value) you have to share next door. I think with a few more practice sessions using the place value boards, the kiddos will really understand how to write money, its relation to place value, and adding with regrouping. I hope to continue this with subtraction!