Arithmetic Grade Four
Lesson One hundred and seventy-five: Functions
We can "plug" a number into a function to produce a value. Here's a real
simple example:
| INPUT | FUNCTION: ? + 5 |
OUTPUT |
| 5 |
5 + 5 |
10 |
| 10 |
10 + 5 |
15 |
| 15 |
15 + 5 |
20 |
| 20 |
20 + 5 |
25 |
In the left hand column we have initial values and the right hand column
contains the results of "plugging" the initial values into the function (? +
5) where we replace the question mark with the input value. So, when we
replace the question mark with 5 the equation becomes 5 + 5 which yields 10.
When we repace the ? with 10 the equation becomes 10 + 5 which yields 15.
Here's another example:
| INPUT |
FUNCTION: ? - 5
| OUTPUT |
| 5 |
5 - 5 |
0 |
| 10 |
10 - 5 |
5 |
| 15 |
15 - 5 |
10 |
| 20 |
20 - 5 |
20 |
Now you get to try a few of these yourself.
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