If a quantity is referred to as 'multiplied by' another quantity, what operation is being described?

When a quantity is described as 'multiplied by' another quantity, the operation being referred to is multiplication. This term indicates that one quantity is being increased by combining it with a specified number of equal groups represented by the other quantity. In mathematical terms, if you have a number, say A, and it is said to be 'multiplied by’ another number, B, this expresses the operation A × B.

In contrast, the other operations mentioned are distinct and do not align with the idea of combining quantities in the way multiplication does. Addition involves combining quantities to increase their total without the concept of grouping, division refers to splitting a quantity into equal parts, and subtraction indicates removing a quantity from another. Hence, the operation of multiplication is specifically indicated by the phrase 'multiplied by', making it the correct answer in this context.