It is 1.375.
http://wiki.answers.com/Q/What_is_1_and_3_over_8_i...

3/8 equals 0.375 in decimal form.
http://www.chacha.com/question/whatisthedecimal...

1/8 = 0.125. 0.125 x 3 = 0.375. Source(s) or you could use a calculator.
http://answers.yahoo.com/question/index?qid=201108...

to convert any fraction to a decimal divide the numerator (top) by the denominator (bottom) 3 divided by 8 equals .375.
http://wiki.answers.com/Q/How_did_you_get_0.375_as...
