Five Circles, Pentadd and Hexagon Puzzles

Good morning!

Today we are going to problem-solve with some brain teaser puzzles.

The first one is called Five Circles where you have to place the numbers 1,2,3,4 and 5 in the circles so that each line has the same total.

The second puzzle is called Pentadd where the  numbers in the blue shapes are the sums of the letters in the red circles. What are A, B, C, D and E?

The last three puzzles are Hexagon Puzzles with increasing numbers to add or subtract. The last one is with decimal numbers. Can you solve all of them?

Good luck!

Dr Webster