All Operations in the Order of Operations: Decimal numbers

$4.5+12.5+10.5-13.5=\text{?}$

Let's solve the exercise from left to right since we are only dealing with addition and subtraction operations:

$4.5+12.5=17$

$17+10.5=27.5$

$27.5-13.5=14$

$14$

$3.5\times4+16\times2.5=\text{?}$

According to the order of operations rules, we must first solve the multiplication exercises and then add them together:

$(3.5\times4)+(16\times2.5)=$

$14+40=54$

$54$

$-7-(-5)+8.5+(-13)=\text{?}$

Let's open the parentheses and pay attention to the minus and plus signs, which change accordingly:

$-(-5)=5$

$8.5+(-13)=8.5-13$

We get:

$-7+5+8.5-13=$

Now let's solve the exercise from left to right:

$-2+8.5-13=$

$6.5-13=-6.5$

$-6.5$

$7.5+(-9.5)+5+(-13.5)=\text{?}$

Let's open the parentheses and pay attention to the minus and plus signs, which change accordingly:

$+(-9.5)=-9.5$

$+(-13)=-13$

We get:

$7.5-9.5+5-13.5=$

Now let's solve the exercise from left to right:

$-2+5-13.5=$

$3-13.5=-10.5$

$-10.5$

$\frac{8.5\times10}{2}=\text{?}$

$42.5$