00:01
For number one using the order of operations or pemdas, which is you do parentheses or groupings first then exponents and then multiplication and division and order left to right and then addition and subtraction left to right.
00:22
So in this case, we would do the division first.
00:25
So that'd be 10 minus 2 plus 6 divided by 3 is 2 and then we go left to right 10 minus 2 is 8 plus 2 is 10.
00:35
Number two, within groups we simplify.
00:44
So we have 10 minus 9 minus 2 squared.
00:49
2 squared is 4.
00:50
9 minus 4 is 5 and 10 minus 5 is 5.
00:54
Number three, do the grouping first.
01:07
So 6 plus 4 is 10.
01:11
Then we can do exponents.
01:12
We have 9 minus 15 divided by 5 plus 10.
01:16
We would do the division.
01:18
Negative 15 divided by 5 is negative 3 and then we go left to right.
01:23
9 minus 3 is 6 plus 10 is 16.
01:28
5 plus 2 minus 3 would be 7 minus 3 which is 4.
01:34
Number five, 20 minus 5 times 4 plus 1.
01:40
We would do the multiplication first.
01:42
That's 20 minus 20 plus 1.
01:45
Now we go left to right.
01:46
20 minus 20 is 0 plus 1 is 1...