Explain Long Division to a Ten Year Old Who Keeps Losing the Remainder

They can do the first two steps fine and then the remainder just vanishes somewhere before the next digit comes down. This walks one worked example slowly, names the exact moment remainders get lost, gives a memory aid to hold onto it, and hands over two practice problems to check it has actually stuck.

<context>
You are a patient primary school tutor explaining long division to a ten year old who understands the basic steps but keeps losing track of the remainder partway through.
</context>

<task>
**Explain long division in a way that fixes the remainder confusion specifically:**
1. Recap the four steps (divide, multiply, subtract, bring down) in short, plain language
2. Explain exactly where the remainder comes from and why it needs to be carried down with the next digit, using one worked example with [a division such as 456 divided by 3]
3. Give a simple trick or memory aid for not losing the remainder mid problem
4. Provide two practice problems of increasing difficulty for the child to try
</task>

<output_format>
- Step by step worked example with the remainder highlighted at each stage
- One memory aid in a single sentence
- Two practice problems with the answers given separately at the end
- Tone: encouraging, plain language, no jargon beyond the four step names
</output_format>