The Commutative property: Worded problems

First, we calculate how many screws the factory produces in total in 7 days:

$7\times300=2100$

Now we subtract the number of defective screws that we know the factory discarded on the second day:

$2100-14=2086$

Now let's count the number of defective screws that we know the factory discarded on the fourth day:

$2086-7=2079$

Now we record the number of defective screws that we know the factory discarded on the fifth day:

$2079-26=2053$

Let's consider the number of kilometers Damian ran each day

On the second day it is written "round trip", that is, twice.

Therefore, we write the following exercise:

$3.4+2\times1.18+2.6=$

We solve the multiplication exercise:

$3.4+2.36+2.6=$

We arrange the exercise using the commutative property, to make it more convenient to solve:

$3.4+2.6+2.36=$

We solve the exercise from left to right:

$3.4+2.6=6$

$6+2.36=8.36$

First, we find how many cakes there are in total.

Let's pay attention to the phrase: "Silvia and Monica tripled the number of cakes"

That is, if Ana brings 5 cakes, then now there are:

$5\times3=15$

Now we find the number of slices.

If each cake is divided into 12 slicesand there are a total of 15 cakes, then:

$15\times12=180$

180 total slices. In other words, enough for 180 students.