multiply first, and then add
You have to multiply to find area you have to add to find perimiter
you are suppose to MULTIPLY on area.
GCF is a single number. You can't add a GCF.
Multiply
You multiply.
multiply
Knowing the LCM will help when adding or subtracting unlike fractions. By finding the LCM of the denominators, (called the lowest common denominator) you can convert unlike to like fractions and proceed with the adding or subtracting. Knowing the GCF helps reduce a fraction. By finding the GCF of the numerator and the denominator and dividing both of them by it, you can reduce a fraction to its lowest terms (simplest form). If the GCF is 1, the fraction is in its simplest form. You can successfully multiply fractions without knowing the GCF or LCM.
170
you can multiply 281 and 3 you can add 840 and 3
Multiply for the area, add for the perimeter.
you add