A privacy-conscious worked example with the original question, step-by-step reasoning, common traps, and similar practice.
Guided solution
To find out how much water Mia poured into the glass, we need to look at the change in water level in the container. The initial amount was 890mL, and the final amount is 800mL. The difference between these two amounts is the volume of water poured into the glass.
The problem involves basic subtraction and reading a measurement scale, which are fundamental skills for grade-4 students.
The water level in the container decreased from 890mL to 800mL, indicating that 90mL was poured out.
