1/2 a pound per dog
3 1/2=3.5lbs
3.5÷7=.5
.5=1/2
In the initial number xx7,xxx; 7 is in the thousands place meaning its value is 7,000.
If it is moved to the tens place = xxx,x7x then it's value will decrease, it will become 70 only.
Every placement has its corresponding values, thus whereven the number 7 is place it is multiplied by its corresponding values (ones, tens, hundreds, etc).
Answer is B. Have a nice day.
