You should use your calculator for such simple sums. It is far quicker and involves fewer key depressions than posting the question on WA. But since you seem unable to carry out even this simple task, the answer is 3.166...
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19 over 4 as a decimal equals 4.75 as a decimal.
19 over 25 in decimal = 0.76
The decimal for 19/38 is .5
Expressed as a decimal, 19/10 is equal to 1.9.
It's 3.16 and next time write the question correctly.