Unit 5: Rational Number Arithmetic Retake Study Guide

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 add two rational numbers with different signs?

Back

To add two rational numbers with different signs, subtract the absolute values and keep the sign of the number with the larger absolute value.

Front

What is the process to subtract a rational number from another?

Back

To subtract a rational number, add its opposite. For example, a - b is the same as a + (-b).

Front

What is the final elevation if a bird starts at 20 m and changes 16 m?

Back

The final elevation is 36 m.

Front

How do you find the final temperature after a change?

Back

To find the final temperature, add the change in temperature to the starting temperature.

Front

What is the final temperature if the start temperature is -20°C and the change is 35 degrees warmer?

Back

The final temperature is 15°C.

Front

How do you calculate the temperature from hours ago if it is falling?

Back

Multiply the rate of fall by the number of hours and subtract that from the current temperature.

Front

What was the temperature 4.5 hours ago if the current temperature is 0°C and it is falling at a rate of 3°C per hour?

Back

The temperature 4.5 hours ago was 13.5°C.

Front

What is the difference in height between two points above and below sea level?

Back

To find the difference in height, add the absolute values of both heights.

Front

What is the difference in height between an albatross flying at 100 m above the surface and a shark swimming 30 m below?

Back

The difference in height is 130 m.