Adding and Subtracting Rational Numbers

Front

What is the least common denominator (LCD) of 6 and 9?

Back

The LCD of 6 and 9 is 18.

Front

1/4 - 3/10 = ?

Back

-1/20

Front

What is -23.4 - 3.4?

Back

-26.8

Front

When adding decimals with different signs, what do you do?

Back

Subtract and take the sign of the larger number.

Front

When adding decimals with the same sign, what do you do?

Back

Add and keep the sign.

Front

What is a rational number?

Back

A rational number is any number that can be expressed as a fraction a/b, where a and b are integers and b ≠ 0.

Front

How do you add two rational numbers with different signs?

Back

Subtract their absolute values and take the sign of the number with the larger absolute value.

Front

How do you subtract a rational number from another?

Back

To subtract a rational number, add its opposite.

Front

What is the result of 5/8 + 1/4?

Back

The result is 7/8.

Front

What is the result of -1/3 + 2/3?

Back

The result is 1/3.