Question

Matt is showing his work in simplifying (6.2 − 1.6) − 4.4 + 7.8. Identify any error in his work or reasoning.

Step 1: (6.2 − 1.6) − 4.4 + 7.8
Step 2: 6.2 + (− 1.6 − 4.4) + 7.8 (commutative property)
Step 3: 6.2 − 6 + 7.8
Step 4: −14 − 6 = 8 (commutative property)
Step 5: 14 − 6 = 8

Answer 1

@FibonacciChick666

Answer 2

so, start by doing it yourself. Don't even look at what they give you.

Answer 3

Step 2 cummative instead of associative

Answer 4

good, yea, that needed to be fixed. What else?

Answer 5

isnt that the only one??

Answer 6

(you said it backwards though I think.)

Answer 7

well, start at step 3

Answer 8

6.2 − 6 + 7.8

Answer 9

what can you put together?

Answer 10

the question is only about Step 2 and 4 but Step three is prob assotative

Answer 11

no, I just mean simplify step 3. So what would you get if you put stuff together.

Answer 12

Idk

Answer 13

6.2 − 6 + 7.8 <---you can't put two of these items together?

Answer 14

OHHHHHHH!!!!!

Answer 15

I thought you meant what the property

Answer 16

haha nah, just the numbers for now

Answer 17

easy thats 8

Answer 18

ok, so what if I moved it around first like this nd added some parentheses. Could you show me the two steps that would get you to 8?
\[6.2 − 6 + 7.8=(6.2 +7.8)− 6 \]

Answer 19

Quick question I need to sleep so did I get the answer right that cummtivate property instead of assotative Step 2?

Answer 20

Yes I can lol

Answer 21

Wait i think i do?

Answer 22

you are saying it backwards. assoc instead of commutative

Answer 23

but you have the idea. and so in step 4 there is a big boo boo

Answer 24

wrong one

Answer 25

oh. I didn't realize it was multiple choice

Answer 26

I agree

Answer 27

so it D?

Answer 28

its alright lol!

Answer 29

i gotta go !!

Answer 30

night :)

Answer 31

please

Answer 32

So D

Answer 33

I thought we established that?

Answer 34

OH LOL!