A piece of cake is something very easy to do, no trouble at all. Literally it is a slice of cake, and the image is easy to remember: eating a slice of cake takes no effort. The idiom is conversational: you say it to friends and colleagues, but in an IELTS essay you would write easy or straightforward instead.
When would you say piece of cake?
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be + a piece of cake; a piece of cake + for + person; Piece of cake! (short reply)
- The tax form was a piece of cake for my sister, who works as an accountant.
- Setting up the new printer was a piece of cake, and it only took five minutes.
- After years of Moscow traffic, driving in a small English town was a piece of cake.
What changed
First versionI'm sure the interview will be piece of cake for you.
RevisionI'm sure the interview will be a piece of cake for you.
The idiom is often learned as a fixed phrase without a. But piece behaves here just as it does in a piece of paper or a piece of advice: in a full sentence it needs a. The correction adds only that: will be a piece of cake.
The article disappears only in a short reply where the start of the sentence is left out. If someone asks Can you fix my bike by Saturday?, you can answer Sure, piece of cake. In a full sentence, a is needed: It was a piece of cake.
Your turn
I was nervous about the exam, but the first part was ___ and I finished it in ten minutes.
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a piece of cake — The first part was done in ten minutes, and but contrasts this with the nerves: the task turned out to be easy, a piece of cake. A real challenge means “a serious test” and doesn't fit with finishing the work so quickly.
Think of a task you were worried about that turned out to be simple. Name the task and explain why it went easily.
I was worried about my first presentation in English, but it was a piece of cake because I had practised it with a friend five times.
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