Basic Operations and Properties of Numbers

This video tutorial covers multiplying rational numbers, focusing on the rules for positive and negative signs. It includes practical problems such as calculating the distance a skydiver falls, writing expressions for money withdrawals, and finding common denominators for fraction operations. The tutorial concludes with a geometry problem on calculating the perimeter of a track using circumference.

What is the result when you multiply two negative numbers?

• A positive number

• A negative number

• Zero

• It depends on the numbers

If a skydiver descends at 16 feet per second, how far will they fall in 20 seconds?

• 160 feet

• 320 feet

• 480 feet

• 640 feet

What is the result of multiplying a negative number by a positive number?

• A negative number

• A positive number

• It depends on the numbers

• Zero

When multiplying fractions, what is the first step?

• Add the numerators

• Multiply the numerators

• Divide the denominators

• Subtract the denominators

How would you represent four withdrawals of $40 each in an expression?

• -40 / 4

• 4 * 40

• 4 + 40

• -4 * 40

What is the common denominator for fractions with denominators 2, 4, and 5?

• 10

• 15

• 20

• 25

What is the perimeter of a track with two straight sections of 277 each and a circular section with a diameter of 135?

• 554 + 135π

• 554 + 270π

• 277 + 135π

• 277 + 270π

What is the result of multiplying -8 by 5?

• -40

• 13

• 40

• -13

What is the result of 49 divided by 20?

• 2.5

• 2.55

• 2.45

• 2.6

What is the circumference of a circle with a diameter of 135?

• 135π

• 135

• 270

• 270π