sumrule
nounUK /ˈsʌm ruːl/
US /ˈsʌm ruːl/
A sum rule is a rule that tells you how to add things up.
The teacher explained the sum rule so we could add the numbers quickly.
RELATED WORDS
OTHER MEANINGS
2. In physics, a mathematical relation that the total of certain quantities must equal a fixed value.
The physicist used a sum rule to check that the energies added up correctly.
3. In math, a rule for finding the sum of a series or set of terms.
The sum rule helped us find the total of the number pattern.
4. A basic guideline in arithmetic for combining numbers.
Remember the sum rule when you add the prices at the store.