Find each product mentally. 7 times 3.8

To do it mentally means to do it in your head

first do 7 * 3 = 21 in your head

than do 7 * 0.8 = 5.6 (this might be hard to do in your head but you know 7*8 = 56 so add a decimal since it is 0.8 not 8)

Add : 21 + 5.6 = 26.6

Final Answer : 26.6