Adding and Subtracting Rational Numbers

Front

What is a rational number?

Back

A rational number is any number that can be expressed as the quotient or fraction of two integers, where the denominator is not zero.

Front

How do you rewrite a subtraction problem as an addition problem?

Back

To rewrite a subtraction problem as an addition problem, you change the subtraction of a negative number into addition. For example, a - b can be rewritten as a + (-b).

Front

What is the result of -5.66 - (-4.1)?

Back

The result is -5.66 + 4.1 = -1.56.

Front

How do you add a positive and a negative rational number?

Back

To add a positive and a negative rational number, subtract the smaller absolute value from the larger absolute value and keep the sign of the number with the larger absolute value.

Front

What is the sum of 4/9 and -2/3?

Back

The sum is -2/9.

Front

How do you find the change in temperature when it goes from a positive to a negative value?

Back

To find the change in temperature, subtract the final temperature from the initial temperature. For example, 15 - (-12) = 15 + 12 = 27 degrees.

Front

What is the result of 2 6/9 + (-5 1/4)?

Back

The result is -2 7/12.

Front

How do you simplify the expression (-4) + 8 - 5?

Back

First, add 8 and -4 to get 4, then subtract 5 to get -1.

Front

What is the absolute value of a number?

Back

The absolute value of a number is its distance from zero on the number line, regardless of direction. For example, |-3| = 3 and |3| = 3.

Front

What does it mean to add two negative numbers?

Back

When adding two negative numbers, the result is also negative. For example, -2 + (-3) = -5.