Description: Sal uses place value and a number line to subtract decimals, such as 1.5 - 0.7. So let's say we have 3/10 minus 2/10. Well there's a bunch of ways you could tackle it, and I encourage you to pause the video and try to do it on your own before I work through it with you. You could view this as 3/10, and then we're going to take away 2/10.*Teacher Advisor is 100% free.