my dd had a difficulty understanding similar questions so I devised a way of explaining to her - this maybe frowned upon by teachers but it has worked for me.
You have 3 types of sandwich, 2 types of cake and 4 types of biscuit. First consider the sandwich and cake combination. Draw 3 circles vertically, representing the sandwiches, and then 2 circles adjacent to the 3 circles, representing the cakes. Now draw a line from each sandwich to each cake and you will find you have six combinations. Now draw six circles in a vertical line, representing the 6 combinations of cakes and sandwiches and 4 circles in a line adjacent to represent the biscuits. Now draw a line from each of your 6 combinations to each type of biscuit and you will find that you 24 combinations. Now find which of the answers gives you 24 combinations.
This is just a method to teach. With practice, children should be encouraged to appreciate that the number of combinations is simply a product of the types.
I hope this helps
Thank you! That really helps and I get it now!
Honestly, I'm not usually this dim but I just couldn't get my head around it. Thank you both!