STEM investigation for gifted 1st and 5th graders
M. brought her big bin of Perler beads to school for show and tell.
We couldn't believe how many beads she had!
The container said it contained 6000 beads, but was it true?
Time for a scientific investigation...
We got out many of the scientific measuring tools we have at Double Creek to measure the beads.
Even though she knew it was silly, M. used the thermometer to measure the temperature of the beads.
Next, with the same silliness, T. measured the height of the beads with a ruler.
Next, they got out the tools for measuring volume.
M tried sucking up the beads with the syringe. The beads didn't fit.
Then, T used the erlenmeyer flask to measure some beads. At least they fit in the container.
They decided to measure more beads using tools to measure volume.
The beads seemed to get stuck in the rounder funnel, so they used a more standard funnel to fill the graduated cylinder.
Eventually they had used so many measuring devices that they ran out of beads.
They added up the volumes using math manipulatives for regrouping. They had 875 ml of beads!
Then Sherilyn asked them how MANY beads they had.
Uh oh. Not 875. How many did they have?
They started counting but didn't plan to count ALL the beads.
They decided to count 25 ml of beads.
If they divided that number of beads into 25 piles, then they could figure out how many beads were in each ml.
Yes, they were on the right track.
They figured out that there were 174 beads in 25 ml of beads.
That meant that every ml has about 7 beads.
Are you following all this? Good.
Now they just needed to find out how many beads were in 875 ml of beads.
Time to get out the math manipulatives again...
Sherilyn will write down the data as the kids figure it out.
They decided to figure out 875 + 875 + 875 + 875 + 875 + 875 + 875.
This was, of course, the same as:
700 + 700 + 700 + 700 + 700 + 700 + 700 + 700
(Sherilyn would have done 7 800s, but she was just the lab assistant, not the scientist.)
plus
70 + 70 + 70 + 70 + 70 + 70 + 70
plus
5 + 5 + 5 + 5 + 5 + 5 + 5
It turns out that when you add all of these together, you get 6125.
6125 beads!
THEN, they invited the 5th grade class to come check their work...
The 5th graders used a scale to measure the weight of the beads. The beads weighed 335 grams.
Then they figured out that 100 beads weighed 6 grams.
They then used the unit weight to calculate total number of beads.
335 grams / 6 grams X 100 = 5583 beads!
Both groups came up with answers near 6000, which showed that using both weight and volume were a pretty good ways to estimate bead quantity, considering it was a container of 6000 beads, according to the manufacturer.
Great job, young scientists!