Examples with solutions for Associative Property: Using variables

Exercise #1

67x+87x+323x= \frac{6}{7}x+\frac{8}{7}x+3\frac{2}{3}x=

Video Solution

Step-by-Step Solution

Let's solve the exercise from left to right.

We will combine the left expression in the following way:

6+87x=147x=2x \frac{6+8}{7}x=\frac{14}{7}x=2x

Now we get:

2x+323x=523x 2x+3\frac{2}{3}x=5\frac{2}{3}x

Answer

523x 5\frac{2}{3}x

Exercise #2

2+a42= 2+\frac{a}{4}-2=

Video Solution

Step-by-Step Solution

We move the fraction to the beginning of the exercise and will place the rest of the exercise in parentheses to make solving the equation easier:

a4+(22)= \frac{a}{4}+(2-2)=

a4+0=a4 \frac{a}{4}+0=\frac{a}{4}

Answer

94 \frac{9}{4}

Exercise #3

5+3+4= -5+3+4=

Video Solution

Step-by-Step Solution

This exercise can be solved in order, but to make it easier, the associative property can be used

5+(3+4)= -5+(3+4)=

5+7= -5+7=

75=2 7-5=2

Answer

2 2

Exercise #4

34×23×214x= \frac{3}{4}\times\frac{2}{3}\times2\frac{1}{4}x=

Video Solution

Step-by-Step Solution

Let's begin by combining the simple fractions into a single multiplication exercise:

3×24×3×214x= \frac{3\times2}{4\times3}\times2\frac{1}{4}x=

Let's now proceed to solve the exercise in the numerator and denominator:

612×214x= \frac{6}{12}\times2\frac{1}{4}x=

Finally we'll simplify the simple fraction in order to obtain the following:

12×214x=118x \frac{1}{2}\times2\frac{1}{4}x=1\frac{1}{8}x

Answer

118x 1\frac{1}{8}x

Exercise #5

10.1x+5.2x+2.4x= 10.1x+5.2x+2.4x=

Video Solution

Step-by-Step Solution

We will factor each of the terms in the exercise into a whole number and its remainder.

We get:

10x+0.1x+5x+0.2x+2x+0.4x= 10x+0.1x+5x+0.2x+2x+0.4x=

Now we'll combine only the whole numbers:

10x+5x+2x=15x+2x=17x 10x+5x+2x=15x+2x=17x

Now we'll calculate the remainder:

0.1x+0.2x+0.4x=0.3x+0.4x=0.7x 0.1x+0.2x+0.4x=0.3x+0.4x=0.7x

And now we'll get the exercise:

17x+0.7x=17.7x 17x+0.7x=17.7x

Answer

17.7X

Exercise #6

0.2x+8.6x+0.65x= 0.2x+8.6x+0.65x=

Video Solution

Step-by-Step Solution

According to the order of operations rules, we'll solve the exercise from left to right:

0.2x+8.6x=8.8x 0.2x+8.6x=8.8x

We'll break down 8.8 into a smaller addition exercise that will be easier for us to calculate:

8x+0.8x+0.65x= 8x+0.8x+0.65x=

Now we'll use the commutative property since the exercise only involves addition.

Let's focus on the leftmost addition exercise, remembering that:

0.8=0.80 0.8=0.80

We'll calculate the following exercise:

0.80x+0.65x=1.45x 0.80x+0.65x=1.45x

And finally, we'll get the exercise:

8x+1.45x=9.45x 8x+1.45x=9.45x

Answer

9.45X

Exercise #7

4a+(5a2)4a+10= 4a+(5a-2)-4a+10=

Video Solution

Step-by-Step Solution

According to the rules of the order of operations, we first eliminate the parentheses.

Remember that a positive times a positive will give a positive result, and a positive times a negative will give a negative result.

Therefore, we obtain:

4a+5a24a+10= 4a+5a-2-4a+10=

Now, we arrange the exercise in a more comfortable way using the substitution property:

4a+5a4a+102= 4a+5a-4a+10-2=

We solve the exercise from left to right, starting by adding the coefficients a:

4a+5a4a=9a4a=5a 4a+5a-4a=9a-4a=5a

Now we obtain:

5a+102=5a+8 5a+10-2=5a+8

Answer

5a+8 5a+8

Exercise #8

356×556×13x= 3\frac{5}{6}\times5\frac{5}{6}\times\frac{1}{3}x=

Video Solution

Step-by-Step Solution

First, let's convert all mixed fractions to simple fractions:

3×6+56×5×6+56×13x= \frac{3\times6+5}{6}\times\frac{5\times6+5}{6}\times\frac{1}{3}x=

Let's solve the exercises with the eight fractions:

18+56×30+56×13x= \frac{18+5}{6}\times\frac{30+5}{6}\times\frac{1}{3}x=

236×356×13x= \frac{23}{6}\times\frac{35}{6}\times\frac{1}{3}x=

Since the exercise only involves multiplication, we'll combine all the numerators and denominators:

23×356×6×3x=805108x \frac{23\times35}{6\times6\times3}x=\frac{805}{108}x

Answer

805108x \frac{805}{108}x

Exercise #9

56x+78x+24x= \frac{5}{6}x+\frac{7}{8}x+\frac{2}{4}x=

Video Solution

Step-by-Step Solution

First, let's find a common denominator for 4, 8, and 6: it's 24.

Now, we'll multiply each fraction by the appropriate number to get:

5×46×4x+7×38×3x+2×64×6x= \frac{5\times4}{6\times4}x+\frac{7\times3}{8\times3}x+\frac{2\times6}{4\times6}x=

Let's solve the multiplication exercises in the numerator and denominator:

2024x+2124x+1224x= \frac{20}{24}x+\frac{21}{24}x+\frac{12}{24}x=

We'll connect all the numerators:

20+21+1224x=41+1224x=5324x \frac{20+21+12}{24}x=\frac{41+12}{24}x=\frac{53}{24}x

Let's break down the numerator into a smaller addition exercise:

48+524=4824+524=2+524=2524x \frac{48+5}{24}=\frac{48}{24}+\frac{5}{24}=2+\frac{5}{24}=2\frac{5}{24}x

Answer

2524x 2\frac{5}{24}x

Exercise #10

11x×5×6= 11x\times5\times6=

Video Solution

Answer

330x 330x

Exercise #11

2x×4.65×6.3= 2x\times4.65\times6.3=

Video Solution

Answer

58.59x 58.59x

Exercise #12

15.6×5.2x×0.3= 15.6\times5.2x\times0.3=

Video Solution

Answer

24.336x 24.336x