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Bill Roper's Journal
Today's Common Core Failure 
22nd-Mar-2016 09:51 pm
On Katie's math worksheet for today, we find the following assignment:

Write a math problem that uses the word time interval.

The question for you: what is wrong with this question?
Comments 
23rd-Mar-2016 03:05 am (UTC) - I gotta talk this out for myself...
Is this like a Kessel Run?

Also, that's two words, not one.

...writing a problem that uses words sounds more like an English assignment.


*goes to look up Time Interval*
https://www.splashmath.com/math-vocabulary/time/time-interval
Difference between the occurrence of two events measured in time.

...........what. What does that even mean. What.

Okay, http://www.mathsisfun.com/definitions/interval.html is better, defining Interval. And one of the definitions is "A definite length of time marked by a start and finish." So presumably a Time Interval would be an interval of time. (One moment whilst I go into a prescriptivist rage.) (Okay, back.) So the assignment should be: "Write a math problem that involves time."

...I'm gonna go have a prescriptivist rage again.
23rd-Mar-2016 03:38 am (UTC)
Aside from calling a phrase a word, this is more of an English problem than a math problem.
23rd-Mar-2016 09:37 am (UTC)
My answer to the assignment:

"How many words are there in 'time interval'?"
23rd-Mar-2016 10:46 pm (UTC)
And Gary for the win! :)
23rd-Mar-2016 10:40 pm (UTC)
While the grammar is wrong the practice is good. Having students develop math problems helps them understand how to apply math to their life.
23rd-Mar-2016 10:46 pm (UTC)
I would agree that the idea is a good one. I'm just getting tired of things that haven't been proofed properly, let alone tried out on actual students.

Katie had a math sheet a few months back that started out with an example (as they tend to do) showing a square that was 10 cm on a side that had an area of 100 square inches.

Um, excuse me?
24th-Mar-2016 03:26 pm (UTC)
Fair, I've just seen common core getting a lot of flack, and at least on math it's pretty solid. I can't speak to the producer of the worksheets.
24th-Mar-2016 03:30 am (UTC)
(see icon)
24th-Mar-2016 01:16 pm (UTC)
Wow! I had no idea Katie was ready for calculus and integration! ;-)
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