 Equations are used everywhere in computers, business, internet searches, medicine, which is why we study them a lot in maths. Because we're going to be studying them a lot, we have names to describe the different parts. Have a look at these two. What makes something a coefficient, a constant or a variable? Pause the video and have a think. A variable is a symbol for a number we don't know yet. It's usually a letter. A number on its own is called a constant. And then the numbers in front of variables. These are called coefficients. They are different to constants because coefficients always multiply by a variable. A number and a letter is a coefficient and a variable, but a number on its own is a constant. If a variable doesn't have a coefficient in front of it, it means the coefficient is one. But we just don't write the one. Because we can even have letters to represent coefficients. Give these questions a go. Pause the video and work them out. Did you get them right? One final word we need to be aware of, exponents. The exponent tells us how many times to multiply the value by itself. The exponent has a few different names. Exponent, index, power. So label the exponent variables, coefficients and constants in this expression. Pause the video and work them out. Did you get them all right? So there we have the names for four different parts of an equation. Can you remember what the difference between an equation and expression, formally and identity is? If you've forgotten, watch this video. If you liked the video, give it a thumbs up. And don't forget to subscribe, comment below if you have any questions. Why not check out our Fuse school app as well? Until next time.