<span><u><em>First way:</em></u> The easiest and simplest way is to <u>count by 1</u> starting from 82 till you reach 512. <u>This will go as follows:</u> 82, 83, 84, 85, ........... , 510, 511, 512
<u><em>Second way:</em></u> We can note that the two given numbers are even numbers. This means that the two numbers are divisible by 2. Therefore, we can <u>count by 2</u> starting from 82 till we reach 512. <u>This will go as follows:</u> 82, 84, 86, 88, ................... , 508, 510, 512
<u><em>Third way:</em></u> We can note that the units digit in both numbers is the same (the digit is 2). This means that we can count from 82 till 512 by <u>adding 10 each time</u>. <u>This will go as follows:</u> 82, 92, 102, 112, ......................, 492, 502, 512
If 18.2% of the 378 milliliters of solution is acid, 0.182(378) ml of the solution is acid. Multiplying this out, our final answer is 68.8 ml of the solution is acid.
For a question like this, all you have to do is remember that a percentage is simply a fraction expressed as a decimal. So, all we have to do is: , and then multiply our decimal answer by 100 to get the percentage: = 0.34 0.34 x 100 = 34 Therefore 34% of the students walk to school. I hope this helped and remember to please try and understand the maths that got the answer, not just writing the answer down :))