Tracy was nervous about the math test being to hard, but once she started, she knew how to solve every problem. “That test was a PIECE OF CAKE!” she said with a smile. What does "PIECE OF CAKE" mean?
"Piece of cake" means something that is very easy to do. (Idiom)
The bright sun was so hot, and sweat poured down Mia’s face as soon as she stepped outside. “It’s so hot that I’m melting into a puddle!” she complained. What does that mean?
Mia is not actually melting; she is saying this to show how extremely hot she feels. (Exaggeration)
After a long day at school, Jake realized he had skipped lunch and his stomach was growling. When he got home, he said, “I’m so hungry, I could eat a horse!” What does that mean?
Exaggerated — Jake is not really going to eat a horse. He is exaggerating to show that he is extremely hungry. (Exaggeration)