Go math grade 5 chapter 6 review test answer key

QUESTION 1

A common multiple is a number that is a multiple of two or more numbers.

For instance 18 is a common multiple of 2 and 3.

This is not the only common multiple.

QUESTION 2

A common denominator is a common multiple of two or more denominators.

For instance a common denominator for

is 4

This is also not the only common denominator.

QUESTION 3

We were given;

We want to estimate the sum of the given fractions.

We collect LCM to obtain,

We multiply out in the numerator to obtain,

We perform the addition in the numerator to obtain,

We express the final answer as a mixed number to obtain,

QUESTION 4

The given expression is .

Let us change the first first mixed number into an improper fraction to get,

We collect LCM of the denominators which is 40 to obtain,

We now multiply out in the numerator to get,

We carry out the subtraction in the numerator to get,

We express the final answer as a mixed number to obtain;

QUESTION 5

The given fraction is .

Let us first of all change each mixed number to improper fractions

We now collect LCM of the denominators to obtain,

We multiply in the numerator to get,

This gives,

QUESTION 6

The given fractions are;

.

The least common denominator is .

We obtain the equivalent fraction by multiplying the denominator and numerator of each fraction by a common factor that gives 18 in the denominator.

.

This gives us;

.

QUESTION 7

The given fractions are;

.

The least common denominator is .

We obtain the equivalent fraction by multiplying the denominator and numerator of each fraction by a common factor that gives 24 in the denominator.

.

This gives us;

.

QUESTION 8

The given fractions are;

.

The least common denominator is .

We obtain the equivalent fraction by multiplying the denominator and numerator of each fraction by a common factor that gives 40 in the denominator.

.

This gives us;

.

QUESTION 9

The given fractions are;

.

The least common denominator is .

We obtain the equivalent fraction by multiplying the denominator and numerator of each fraction by a common factor that gives 10 in the denominator.

.

This gives us;

.

QUESTION 10

The given fractions are;

.

The least common denominator is .

We obtain the equivalent fraction by multiplying the denominator and numerator of each fraction by a common factor that gives 36 in the denominator.

.

This gives us;

.

QUESTION  11

The given fractions are;

.

The least common denominator is .

We obtain the equivalent fraction by multiplying the denominator and numerator of each fraction by a common factor that gives 21 in the denominator.

.

This gives us;

.

QUESTION 12,

The given fraction is

The least common denominator is .

We collect LCD to obtain,

This simplifies to;

QUESTION 13

The given fraction is

The least common denominator is .

We collect LCD to obtain,

This simplifies to;

QUESTION 14

The given fraction is

The least common denominator is .

We collect LCD to obtain,

This simplifies to;