Additive and Multiplicative Comparison

2-8 Multiplicative Comparisons

Comparison Statements & Multiplicative Comparison Statements

These statements from the previous slide are called comparison statements, and since this is dealing with multiplication, we can call these multiplicative comparison statements.

• A DVD costs $15 and a book costs $5. Make a multiplicative comparison statements about the two objects.

• Three books equal the cost of the DVD.

• 5 x 3 = 15

• 15 = 5 x 3

• The DVD costs 3 times as much as the book.

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Multiplicative Comparisons

• Scarlett has 7 crayons in her pencil box. Liam has 4 times as many crayons as Scarlett. 

• How many crayons does Liam have?

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Follow up Questions

Scarlett has 7 crayons in her pencil box. Liam has 4 times as many crayons as Scarlett.

Whose number of crayons is greater?

How do you know?

How many times as great?

Will Liam have more or fewer than 7 crayons?

What equation can we write to represent this situation?

c = 4 x 7

4 x 7 = c

3 * 9 = 27

Open Ended

Show all the work required to solve the following problem.

Will has 9 CDs. Brody has 3 times as many CDs as Will. How many CDs does Brody have?

Open Ended

Show all the work required to solve the following problem.

Alainna worked 3 times as many hours as Ashlan each week during the summer. If Ashlan worked 10 hours each week, how many hours did Alainna work each week?

Please write the equation with unknown, and then solve. Include your answer with "hours" as the unit.

Open Ended

Write or record this as an equation.

42 is 6 times as much as 7.

Open Ended

Write or record this as an equation.

What number is 4 times as much as 9.