Ratio Tables

When working with ratio tables, look for multiplicative relationships.

One kind of relationship you can find is to look for a way to get from one ratio part to another ratio part by multiplying. Here, 6 and 12 are both the bottom part of two ratios. To get from 6 to 12, you can multiply by 2.

Apply the same relationship to the top parts of the ratio.

What is the number of dogs that is missing?

• 12

• 4

• 8

• 6

Tags

CCSS.6.RP.A.1

CCSS.6.RP.A.2

CCSS.6.RP.A.3

Another kind of ratio relationship you can find is to look inside a ratio itself. 2:6 is the top ratio in this table.

To get from 2 to 6, you would multiply by 3. Look at each row and notice that this times 3 relationship continues.

What is the value of x?

• 30

• 3

• 15

• 20

Tags

CCSS.6.RP.A.1

CCSS.6.RP.A.2

CCSS.6.RP.A.3

Will using skip counting or addition patterns always work to find missing values in a table?

• YES, both tables show a perfect skip count or additive relationship.

• NO, the table on the left will not skip count by 7s and 5s perfectly. Ratio tables can skip around.

Tags

CCSS.6.RP.A.1

CCSS.6.RP.A.2

CCSS.6.RP.A.3

Find A.

Write down this table! It will help you solve problems 4-6.

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CCSS.5.OA.B.3

Find B.

Write down this table! It will help you solve problems 4-6.

Tags

CCSS.5.OA.B.3

Find C.

Write down this table! It will help you solve problems 4-6.

Tags

CCSS.5.OA.B.3

Find A.

Write down this table! It will help you solve problems 7-9.

Tags

CCSS.6.EE.A.2

CCSS.6.EE.B.6

Find B.

Write down this table! It will help you solve problems 7-9.

Tags

CCSS.6.EE.B.5

CCSS.6.EE.B.7

CCSS.6.RP.A.1

CCSS.6.RP.A.3

Find C.

Write down this table! It will help you solve problems 7-9.

Tags

CCSS.5.NBT.A.2

Find A.

Write down this table! It will help you solve problems 10-12.

Tags

CCSS.6.RP.A.1

CCSS.6.RP.A.2

CCSS.6.RP.A.3