AI Tutor
Imagine you buy 3 shiny stickers, and each sticker costs 0.4 dollars (40 cents). How much money do you spend in all?
We can find the total by multiplying 3×0.43 \times 0.4 using place value counters!

Tenths as Place Value Counters

A tenth (0.10.1) is what you get when you cut 1 whole into 10 equal pieces.
What happens when we take 3 groups of 4 tenths?

Building Groups of Decimals

Multiplying 3×0.43 \times 0.4 means making 3 equal groups, with 4 tenths counters in each group.
Counting them all up gives us 12 tenths in total.
Can we leave 12 tenths in the tenths place, or do we need to trade?

Trading 10 Tenths for 1 Whole

Just like in regular addition, whenever you collect 10 tenths, you must regroup them into 1 whole.