HOW
HOW: How do you calculate math?: Division and multiplication must be completed before addition and subtraction. Expressions in parenthesis must be treated like a number and calculated first before everything else. If parenthesis are in other parenthesis then work from the inside out. How to do 2+3 x 7=?, First you do 3 x 7 which equals twenty-one. Then you have to add two to twenty-one which equals 23, thus the answer is 23. Here is another example: 100+40-(1000-986)+1000 and that =1126. It equals 1126 because 1000-986=14, 140-14=126, and 126+1000=1126.
How do you do math operations? Say you want to figure out 2560+ 3009, 2300-1000, 30 x 20, and 144 divided by 12. For the first you do 0+9, 6+0, 5+0, and 2+3 which would equal 5569. For the second one you do 0-0, 0-0, 3-0, and 2-1 which would equal 1300. For the third one you do 3 x 2 then add two 0’s which would equal 600. For the last one you do 12 divided by 14 then 12 divided by 24 which would equal 12.
You can also do the operations with decimals or fractions or mixed numbers. Here are some examples on what I just talked about: 10+4-3 x 2 divided by 2 would equal 11. It equals 11 because 10+4=14, then 14-3=11, then 11 x 2=22, and 22 divided by 2 equals 11. 267+733, 987-674, 1000 x 10,000, and 999 divided by 9.
For 267+733 you do 3+7, 6+4, and 2+7 which equals 1000. For 987-674 you do 7-4, 8-7, and 9-6 which equals 313. For 1000 x 10,000 you do 1 x 1 and then add seven zeros and that equals 10,000,000. For 999 divided by 9 you do 9 divided by 9 three times and after you are done the answer is 111. Another good example is 10+36-2 x 2 divided by 11 equals 8.
It equals 8 because 10+36=46, 46-2=44, 44 x 2=88, and 88 divided by 11 equals 8. In the math world it is weird because multiplication and division come first even if they are after the addition and subtraction you still do them first. It is also weird because if the numbers are in parenthesis you have to also do these first to even if they are in the middle of the equation. Here are some examples 2+2 x 3 and 79-69+(2 x 3)+ 10 and the answers are 12 and 26.
I don't know why division and multiplication come first before addition and subtraction but, I do know that it doesn't matter if they come first because it still has the same answer. It still may be confusing for some of you out there but you are going to have to learn this stuff sooner or later and sooner is better anyway. Some of you out there don't want to learn this stuff but, when you do a whole lot of stuff will get easier for you, like cooking, buying things, jobs, and other things that I can't think of right this minute.