Margret couldn't unscrew the jar lid, but I found it a piece of cake.
An example for the use of the idiom 'it's a piece of cake' is: I can run that 100 yard sprint, it'll be a piece of cake'.
She gave birth to triplets.
The idiom, at sixes and sevens means that you are in a state of panic, confusion and uncertainty. You could use this idiom in a sentence by saying, she was at sixes and sevens as to whether or not to tell her best friend that her husband was being unfaithful.
I divided the cake into two equal halves.
It was apt that they had a ball on the cake, given his love of the sport.
An example for the use of the idiom 'it's a piece of cake' is: I can run that 100 yard sprint, it'll be a piece of cake'.
We each had a piece of the birthday cake.
The boy found the project to be a piece of cake because it was incredibly easy.
An example:- "He recorded an album but sold very few copies; the cake wasn't worth the candle!"
That piece of chocolate cake was so tantalizing that I had to take a bite.
She gave birth to triplets.
I allowed myself to eat another piece of cake.
That unattended piece of chocolate cake is quite a temptation.
I had to cram all of my work into my binder.
There are several terms that mean easy. Easy as pie is one expression. The image is that making a pie is simple -- just toss some fruit on top of a crust and bake. Another expression is piece of cake -- again, the image is one of a dessert. Cake is fun to eat, so something that is a piece of cake would be fun and easy. Children often say "easy peasy" as a rhyming idiom. Some examples would be "That math problem was a piece of cake!," or "Riding a bike is easy as pie."
That IS a sentence.
Even though I had already eaten, I couldn't resist the offer of a piece of cake.