Answer:
Alvin got 90% of his test correct
Explanation:
If Alvin got 18 out of 20 on his test we can write this as the fraction 18/20. Now we just need to convert this fraction to percent.
First, we divide the numerator by the denominator. It will look like this: 18 ÷ 20 = 0.9
Next, multiply by 100 to get the percent. Remember that when multiplying by 100 with a decimal u slide the decimal point to the right two times.
We get 90%
Hope that helps u! :)