addition rule
nounUK /əˈdɪʃən ruːl/
US /əˈdɪʃən ruːl/
The addition rule is a math rule that tells you how to add numbers together.
We used the addition rule to find that 2 plus 3 equals 5.
RELATED WORDS
OTHER MEANINGS
2. In probability, a rule for finding the chance that one event or another event happens.
The addition rule helped us find the probability of rolling a 2 or a 4.
3. A basic guideline in arithmetic for combining two or more numbers into a total.
The teacher explained the addition rule before the class practiced adding.
4. A rule in logic for combining statements with 'or'.
Using the addition rule, we can infer that either it is raining or it is sunny.