An easy question on queues for P1–P2, with a step-by-step solution, diagrams and the answer. Queue questions are already in the Hua Xia Cup's P1 and P2 first rounds, and the P4 papers add square formations.
The question
After recess, the class lines up in single file to go back to the classroom.
There are 4 children in front of Ming and 2 behind him.
How many children are in the line?
Show the hints (2)
💡Hint 1: Add the children in front and behind. Who is still missing?
💡Hint 2: Don't forget to count Ming himself.
Worked solution
Have a go first, then read the solution step by step.
1.In front and behind: 4 + 2 = 6.
2.Add Ming himself: 6 + 1 = 7.
⚠️Common mistake: answering 6 and leaving Ming out.
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