find the H. CF using product of primes. 1) 24,30,40

2 is the Highest Common Factor y

Step-by-step explanation: This seems like a trick question. But

Primes of 24: 2,2,2,3

Primes of 30: 2,3,5

Primes of 40: 2,2,2,5

If the question was about 30 and 40, you would take the 2 and 5 they have in common, and get 2*5=10

If it were about 24 and 40, you would take the 2*2*2 they have in common and have 8 as HCF.

For 24 and 30, it would be the 2*3=6

To find the HCF (aka GCF, greatest common factor) you use the prime as many times as they are used in common for the numbers you are factoring.

people went from manufacturing one object at a time by hand to manufacturing many objects in factories