7.5.8 Check Your Understanding

If Elena cycles at 3 meters per second, how far will she travel in 5 seconds?

• 15 meters

• 10 meters

• 5 meters

• 20 meters

What is the value of the expression 16.2 + (-8.4)?

• 7.8

• 8.2

• -7.8

• -8.2

What is the result of -9.2 + (-7)?

• -16.2

• -2.2

• 2.2

• 16.2

Calculate the value

Fill in the blank: The equation 7.1 + 3.4 = 10.5 can also be written as _____.

• 10.5 - 3.4 = 7.1

• 10.5 + 3.4 = 13.9

• 7.1 - 3.4 = 3.7

• 3.4 + 7.1 = 10.5

Which of the following equations is equivalent to 15 - 8 = 7?

• 7 + 8 = 15

• 15 + 8 = 23

• 8 - 15 = -7

• 15 - 7 = 8

What is the equivalent equation for 3 + 2 = 5?

• 5 - 3 = 2

• 5 + 3 = 8

• 2 - 3 = -1

• 3 + 5 = 8

Fill in the blank: The expression -9.2 + (-7) equals _____

• -16.2

• -2.2

• 2.2

• 16.2

If we multiply two positive numbers, is the result positive or negative?

• Positive

• Zero

• 1

• Negative

If we multiply a positive and a negative number, is the result positive or negative?

• Positive

• Zero

• 1

• Negative