Which addition sentences show you how to find 16-9?

Answer choices

9+1=10 , 10+5=15

9+1=10 , 10+6=16 *

9+2=11 , 11+6=17

9+1=10 , 10+9=19

How can I possibly explain to my 2nd grader why 'B'is the correct answer when I can't understand this myself? Can someone please help me understand this?

Subtract to find how many more bottles are in the bin from the top row than the bin from the bottom row.

Bin _ has more bottles than Bin _
Bin _ has more bottles than Bin _
Bin _ has more bottles than Bin _
Bin _ has more bottles than Bin _

A- 15
B- 12
C- 13
D- 9
E- 7
F- 8

9+1=10 , 10+6=16

1 + 6 = 7
7 is the difference between 9 and 16.
16-9=7

I guess that would do it.

But that looks far more complicated than memorizing that 16 - 9 = 7

You can always check it by counting on your fingers.

Which subtraction sentence show you how to find 15-7

My 2nd grader a 7yr old and I did these tonight and this was probably the weirdest homework he's ever brought home. Had to look online to try to explain it to him but hard when even I couldn't figure it out at 1st.

9+1=0=10, 10+6=16

What kind of math they teaching these 2nd graders???

What kind of sorcery is this?!? šŸ˜©

I am not smarter than a 2nd grader anymore it seems

Hey Andy,i just did that question for my daugther , and to tell you the truth I dont even know the answer!