Even more rebus puzzles

Sequel to Some rebus puzzles (easy/medium) and Some more rebus puzzles (medium/hard). These puzzles are hopefully the right difficulty this time.

Good luck!

And yes, the last one is supposed to look like that.

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For more of a challenge try this

Answer

Full answer

Number 1 is:

A piece of cake (ak is part of cake, and the drawing is a indeed a piece of cake)

Number 2 is:

Stay back

Number 3 is:

Half price

Number 4 is:

Put him on the back foot

Number 5 is:

Ace in the hole

Number 6 is:

Think outside the box