15.6 divided by 4

you can use a computer, but not a calculator?

There are lots of handy online sites explaining long division by hand.

here is you're answer: 3.9

To divide 15.6 by 4, you need to follow these steps:

Step 1: Write down the division equation: 15.6 ÷ 4.
Step 2: Start dividing the whole number part of the dividend (15) by the divisor (4). In this case, 15 divided by 4 equals 3 with a remainder of 3.
Step 3: Bring down the decimal point from the dividend to the quotient. The decimal point in 15.6 remains in the same place in the quotient.
Step 4: Add a decimal point to the remainder (3) and bring down a zero. The remainder becomes 30.
Step 5: Divide the new dividend (30) by the divisor (4). 30 divided by 4 equals 7 with no remainder.
Step 6: Write the final quotient as a decimal number by combining the quotient obtained from step 2 (3), the decimal point brought down from the dividend, and the quotient obtained from step 5 (7). The final answer is 3.9.

So, 15.6 divided by 4 is equal to 3.9.