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 ...

Draw two branches from the number 30 to split it into a pair of factors, greater than 1. The factor pair could be 2 and 15, 3 and 10 or 5 and 6. The factor pair of 1 and 30 is not used because the ...