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Video instructions and help with filling out and completing Fill Form 8815 Subtract

Instructions and Help about Fill Form 8815 Subtract

Hi there and welcome to another video from Hegarty Maths. It's Mr. Haggerty here, and in this video, we're talking about adding and subtracting with standard form. Now, to start with, I want to actually ask you a question I've previously asked you about. Imagine someone asks you to evaluate 10 squared plus 10 to the power of 5. Can you imagine what students might do? That's a mistake there. Well, what students like to do is they like to try and find a quick way of doing things, so they might say, "Hmm, 10 times 10 is 20. I know something about adding the powers, so they might say 20 to the power of 7." Now, adding the powers with indices only is true when you multiply indices, isn't it? And remember when I was going through those videos saying to you, "Whatever you do, don't feel obliged to do a trick or try and do something you're not sure of." The only rule I ever taught you with multiplying indices was the following: if you multiply them, you keep the base number the same and you can add the powers. I also told you if you are dividing them, you keep the base number the same. Let's say you can subtract the powers. But I didn't say anything about if you're adding them or subtracting them. I'm afraid if you're adding or subtracting them, you've just got to work them out longhand. Ok, so that wouldn't be allowed. What you would do is just convert that into an ordinary number. What does this mean? Well, it means 10 squared is 100. And what does this mean? 10 to the power of 5 is a hundred thousand. So all I want you to do is add a hundred and...