Jenna bought a gallon of milk at the store for $3.58. About how much change did she recevie from $20 bill?

So,

All we have to do is subtract $3.58 from $20 to find the change Jenna received.

20 - 3.58 = 16.42

Jenna received $16.42.

So 3.58 and a 20.00 dollar bill we subtract

20.00-3.58

break it up

20=4+16

16+4-3.58

focus on the 4.00-3.58 part

4.00=3.00+1.00

3.58=3.00+0.58

1.00+3.00-3.00-0.58

1.00-0.58=1.00 - (0.60-0.02) = 1.00-0.60+0.02=0.40+0.02=0.42

$16.42 is the change