Solving Proportions with Fact Families

Mr. Pastori introduces fact families, explaining their use in solving multiplication and division problems. He provides examples and encourages students to practice on their own. The video also covers solving proportions using relationships and cross multiplication, with examples and practice problems to reinforce learning.

What is a fact family?

• A set of numbers that are all even

• A set of addition and subtraction facts

• A set of multiplication and division facts

• A set of numbers that are all prime

If 2 times 3 is 6, what is 6 divided by 2?

• 4

• 1

• 2

• 3

What is the missing number in the fact family: 15 divided by 5 is 3, so 3 times 5 is?

• 15

• 18

• 12

• 10

If 12 times 6 is 72, what is 72 divided by 12?

• 5

• 8

• 6

• 7

What is the missing number: 6 times some number is 90. That means 90 divided by 6 is?

• 13

• 15

• 12

• 14

How do you solve for R in the proportion 18 divided by some number equals 3?

• Subtract 3 from 18

• Add 18 and 3

• Multiply 18 by 3

• Divide 18 by 3

In cross multiplication, what do you do after setting the products of the diagonals equal?

• Add both sides

• Subtract both sides

• Multiply both sides

• Divide both sides

What is the value of X if 3 times 45 equals 27 times X?

• 3

• 4

• 5

• 6

Which method does the teacher prefer for solving proportions?

• Cross multiplication

• Relationship method

• Guess and check

• Using a calculator

If 27 divided by 3 equals 9, what is 45 divided by 9?

• 4

• 3

• 5

• 6