To find the number between two other numbers be find their mean or average. To do this we add the numbers and divide by the number of numbers we have, 2 in this case.
13+6= 19
19/2= 9.5
9.5 (that's nine and a half) is midway between six and thirteen.
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15
Six.
-78
Thirteen and six hundred four thousandths.
Expressed as a decimal, six and thirteen hundredths is equal to 6.13.