How will you teach a child about 8/10*1

Just as how you would teach multiplication to any child in the beginning. There is 1 set of 2 pencils. 1 * 2 = 2 pencils. There are 2 sets of pencils. 2 * 2 = 4 pencils. You would apply the same concept to 8/10 that any number multiplied by 1 is itself.