Answer:
17.5
Explanation:
38.7
21.2
17.5=
subtract 38.7-21.2 which equalals 17.5
18
This is the answer because:
1) First, round the numbers you are subtracting to nearest unit digit
38.7 = 39
21.2 = 21
2) Now subtract 39 and 21 which equals 18
39 - 21 = 18
Hope this helps! :D
