This Is Eighth Grade ??

IXL ^ | June 12, 2011 | knarf

[knarf]

I'm a failure

[Will88]

And what percentage of eighth graders actually achieve all those math goals each year? From news story after news story, it’s doubtful many in the annual HS graduating classes have achieved them.

Most anyone can put together an impressive list.

[P.O.E.]

Now try them all WITHOUT a calculator

[tsomer]

Or the “3, 4, 5” rule:
{{(3)4}+{(3)3}}^2={(3)5}^2
etc.

[ETL]

“The sum of the square roots of any two sides of an isosceles triangle, is equal to the square root of the remaining side.” - Scarecrow, Wizard of Oz

Also, it isn’t “any” 2 sides, but rather the 2 shorter sides vs the diagonal: (a^2 + b^2 = c^2)

[philman_36]

...beat a battery cable connector onto my car battery with a pair of vise grips.
A perfect example. Why waste all that time and energy going to get a hammer.

[bigheadfred]

Now try them all WITHOUT a calculator

You mean one of those fancy electronic devices or the one in my head?????

Or BOTH????

(This just got really, really hard)

[ETL]

Thanks. Completely forgot that one.

[bigheadfred]

A perfect example. Why waste all that time and energy going to get a hammer.

Not only do you save steps, but you avoid the quandary over choosing the right hammer.

[Blood of Tyrants]

The list is purely wishful thinking. The vast majority will barely be able to multiply 3 digit numbers together, much less that other stuff.

[philman_36]

Not only do you save steps, but you avoid the quandary over choosing the right hammer.
Ball pein ...without a doubt. If you've got to make the trip then at least get the right tool is my way of thinking.

[dsrtsage]

Actually, that one didn’t require the application of pythagorian theorem to solve, because it was a 3-4-5 triangle...3x3=9, 4x3=12, so the hypotenuse=5x3=15

[silverleaf]

IXL is a terrific site, works as well as tutoring for both my kids

If you don’t get the 8th grade material, go back and start at a lower grade and work your way up!

[rsobin]

Don’t force it. Get a bigger hammer.

[bigheadfred]

get the right tool is my way of thinking

Please tell my wife that. She came out to help organize the shed. Go through some boxes. I was sorting tools. She notices and says "you have ELEVEN hammers????...."

[ETL]

Actually, that one didn’t require the application of pythagorian theorem to solve, because it was a 3-4-5 triangle

I always preferred to memorize/use the more general formulas rather than the special case short cuts. Less to remember that way.

[jpsb]

4 is not a factor of 20? Hmmmm, I picked 5 and 4 a got it wrong, I am still trying to figure that one out.

[mad_as_he$$]

What diameter is the pencil?

Does it have an eraser?

Is the eraser(if included) count in the length of the pencil?

If it is a mechanical pencil is there funding to get a custom length one made?

[johngalt42]

While 5 x 4 = 20, you can reduce 4 further to 2 x 2. Therefore, the factors of 20 are 5, 2, and 2. (5 x 2 x 2).

[ETL]

What diameter is the pencil? Does it have an eraser? Is the eraser (if included) count in the length of the pencil?

Lol! A good teacher would be pleased if a kid asked those "real world" questions.

[jpsb]

true but 4 is still a factor of 20.