The question has asked for a product of prime factors. Write all of the circled prime numbers (found in the prime factor tree) as a product. This gives \(2 \times 2 \times 2 \times 5\).

Save guides, add subjects and pick up where you left off with your BBC account. The only even prime number is \({2}\). All other even numbers are divisible by \({2}\). The number \({1}\) is not ...