Page 321 - NUMINO_WB_6B
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184-B2-1
The Sum Rule
1. Find the number of possible outcomes.
Example
There are 4 bus routes and 2 train routes from Jessica’s house to the park. Find
the number of possible ways for Jessica to go to the park from her house.
home park
a. There are 3 bicycle paths and 4 bus routes from Ann’s house to Ricky’s house.
Find the number of possible ways Ann can go to Ricky’s house from her house.
b. There are 5 airplane routes and 3 train routes from city A to city B. Find the
total number of ways Ann can go to city B from city A.
The Sum Rule
1. Find the number of possible outcomes.
Example
There are 4 bus routes and 2 train routes from Jessica’s house to the park. Find
the number of possible ways for Jessica to go to the park from her house.
home park
a. There are 3 bicycle paths and 4 bus routes from Ann’s house to Ricky’s house.
Find the number of possible ways Ann can go to Ricky’s house from her house.
b. There are 5 airplane routes and 3 train routes from city A to city B. Find the
total number of ways Ann can go to city B from city A.
