Why do we have to learn algebra and how do people use it in our daily life?
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There are many reasons.
First of all, when you’re in high school (or middle school) you usually don’t know what career you’re going to choose. Even if you do, things could change. Even if everybody knew, average class have a lot of people, each of which may want to choose a different path. You can’t teach different stuff to every single person, so you try to find a common ground. Math can be useful in many jobs (from plain algebra to more advanced stuff), and basic math knowledge helps you follow STEM classes in college if you want to. College professors don’t want to waste months explaining x+5=2.
Second, a bit of math does help.
Basically everyone in the “real world” uses percentages (10%, 35%) at some point, for taxes, shopping discounts,… That’s algebra.
Or, let’s say you want to build something out of wood, let’s say a fence. Your favorite shop only has 6 and 8 ft wooden boards. How many boards do you need to build a fence in your 3,000 sqft home? How much is that going to cost you?
Or maybe you want a nice pool. Let’s say a 5×10 pool, 5 feet deep. But you need chlorine to kill germs. Someone tells you people generally recommend 85 mL of chlorine every 4,500 liters. How much is that going to be?
Or, let’s say you’re driving around and you have to fill the gas tank. You have 40 bucks left. Can you fill a full tank?
Third, math in school does (or at least should) train some problem solving skills. You face a problem, you look at what you have and try to find a solution. If it doesn’t work, it’s probably because you forgot something along the way or you made a mistake.
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