Exploring Multiplication of Rational Numbers

This video tutorial covers the multiplication of rational numbers, including integers, fractions, and decimals. It explains the rules for determining the signs of the product and provides examples of multiplying both decimals and fractions. The tutorial also includes a real-world word problem involving fractions to demonstrate practical application. The lesson concludes with a summary and instructions for further practice.

Which of the following is NOT a rational number?

• 5

• -7

• √2

• 3/4

What is the result of multiplying two rational numbers with the same sign?

• Negative

• Positive

• Zero

• Undefined

If you multiply -3 by -4, what is the result?

• -12

• 12

• 0

• -7

What is the product of 2 and -5?

• -7

• 10

• -10

• 7

When multiplying -18 by 3.8, what is the correct product?

• -68.4

• 68.4

• -72.4

• 72.4

How do you convert a mixed number to an improper fraction?

• Multiply the whole number by the denominator and add the numerator

• Add the whole number to the numerator

• Multiply the whole number by the numerator and add the denominator

• Subtract the numerator from the whole number

What is the product of -12 and -5 5/6?

• -70

• 70

• -72

• 72

If each person at a party eats 3/8 of a pizza and there are 6 people, how many pizzas are needed?

• 1.5

• 2.25

• 3

• 2.75

What is the mixed number form of 18/8?

• 2 3/4

• 2 1/4

• 2 1/8

• 2 1/2

Why can't you order a quarter of a pizza in the word problem?

• Pizzas are only sold in whole numbers

• Pizzas are only sold in thirds

• Pizzas are only sold in quarters

• Pizzas are only sold in halves