What is a doubles fact?

A doubles fact is a mathematical equation in which two identical numbers are added together, such as 5 + 5 or 8 + 8. Doubles facts are often used as a mental math strategy to help students quickly solve addition problems. By recognizing and memorizing doubles facts, students can improve their fluency and efficiency in computation. Doubles facts can also be used to help students understand other math concepts, such as doubling and halving numbers, and can be a helpful tool for developing number sense.