There are four blocks in a set of legos if bob bought 12.5 sets how many lego blocks does he have

It's multiplication. 

• 12.5 x 4 = 50

So Bob has 50 lego blocks.

Hope this helps! :D

~PutarPotato

If bob bought 12.5 sets with 4 blocks each, then he got 4 blocks 12.5 times.
4*12.5=50.

Think of it like this, if he bought 12 Lego sets, he would get 4 blocks 12 times.
4+4+4+4+4+4+4+4+4+4+4+4=48.

However, since he bought half a Lego set, he would get half the blocks in the set.
4/2=2.

Now, you can add the blocks from the 12 sets, and the half set he bought.
48+2=50

50 is your final answer.