7. Dividing Decimals
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Pay close attention to the order of operations.
B
18+3^2Ă· [3* (8-5)] Notice also that even within this parenthetical expression, we must follow the order of operations. 3* (8-5) Let's do it!
Operation | Before Simplification | After Simplification |
---|---|---|
Subtraction inside parentheses | 18+3^2Ă· [3* ( 8- 5)] | 18+3^2Ă· [3* ( 3)] |
Multiplication inside square brackets | 18+3^2Ă· [ 3* 3] | 18+3^2Ă· 9 |
Calculate power | 18+3^2Ă· 9 | 18+ 9Ă· 9 |
Divide | 18+ 9Ă· 9) | 18+ 1 |
Add terms | 18+ 1 | 19 |
We can also evaluate this expression using a calculator. To do so, we type it as shown below.
Whenever using a calculator for a complicated expression such as this, be very careful when placing the parentheses. A calculator will only do what it is told to do, not what you meant for it do.