Based on the question, we are looking for a number that is equal to 31 when you divide the number by 4 (or multiply by 1/4, same thing). You can also represent this with an equation: 1/4x=31. This says: 1/4 of a number x is equal to 31.
1/4x=31
4(1/4x)=31(4)
x=124
You don't need an equation for this type of problem (you can simply multiply 31 by 4), but it can help if you are not sure what calculations to do!
Hi! so you didn’t let us know which side length is missing and it kind of matters so i’ll attach an image so you can just copy the one that looks most like yours.
