The easiest way is to input the fraction into a calculator as a division problem. For instance, this would be 1/2=0.5. If a calculator is unavailable, find an equivalent fraction with a denominator equal to 10, 100, 1,000, etc. Then take the number on the top and put the decimal point in the number of zeros in the bottom places in the top. That's a convoluted explanation, so I can simplify a bit. If you have the fraction $${\frac{{\mathtt{7}}}{{\mathtt{8}}}}$$ that you want to turn into a decimal, find the equivalent fraction with an exponent of 10. Do that by multiplying the bottom number by another number to make it an exponent of ten. Since our denominator is 8, that number is 125. Multiply both sides by that number and you should get $${\frac{{\mathtt{875}}}{{\mathtt{1\,000}}}}$$. Then, since 1,000 has three zeros, the decimal point goes three places to the left.
This method is very complicated, and let's face it: there are calculators everywhere, including on your phone, even if it's not a smartphone.
The easiest way is to input the fraction into a calculator as a division problem. For instance, this would be 1/2=0.5. If a calculator is unavailable, find an equivalent fraction with a denominator equal to 10, 100, 1,000, etc. Then take the number on the top and put the decimal point in the number of zeros in the bottom places in the top. That's a convoluted explanation, so I can simplify a bit. If you have the fraction $${\frac{{\mathtt{7}}}{{\mathtt{8}}}}$$ that you want to turn into a decimal, find the equivalent fraction with an exponent of 10. Do that by multiplying the bottom number by another number to make it an exponent of ten. Since our denominator is 8, that number is 125. Multiply both sides by that number and you should get $${\frac{{\mathtt{875}}}{{\mathtt{1\,000}}}}$$. Then, since 1,000 has three zeros, the decimal point goes three places to the left.
This method is very complicated, and let's face it: there are calculators everywhere, including on your phone, even if it's not a smartphone.