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Template

As explained in Build a Reasoning Model (From Scratch)

A fixed prompt structure used to shape how an LLM formats and reasons in its response.

A prompt template standardizes the instructions and answer format sent to an LLM. In math evaluation, it asks for a solution and places the final result on a separate line in boxed form, making automatic checking more reliable. section 3.9

Implement the template as part of the evaluation workflow:

  • Render fixed instructions together with the problem text and an explicit Answer field. section 3.9
  • Generate the response through the existing text-generation wrapper, then extract the final candidate answer. section 3.9
  • Normalize and grade the extracted answer with the verification pipeline, rather than treating formatting alone as correctness. section 3.10
  • Compare template choices on a larger dataset: the short-output template can reduce token use but may lower accuracy, while no template may produce longer, correct reasoning. section 3.9

Math evaluation template

A rendered prompt identifies the model as a helpful math assistant, supplies a question, and requests the final result as \boxed{ANSWER}. A generated response may be concise and correctly formatted yet still mathematically incorrect, so extraction and grading remain necessary. section 3.9 section 3.10

Listing 3.13 Function to render a prompt template for math evaluation
def render_prompt(prompt):
    template = (
        "You are a helpful math assistant.\n"
        "Answer the question and write the final result on a new line as:\n"
        "\\boxed{ANSWER}\n\n"
        f"Question:\n{prompt}\n\nAnswer:"
    )
    return template

Inspect the Python function that renders the fixed instructions, boxed-answer requirement, question, and answer prompt. section 3.9

How Build a Reasoning Model (From Scratch) covers it

How deep it goes
Implements rendering, generation, extraction, and grading, then defers template selection to larger-dataset comparison.
Examples
Demonstrates boxed math answers, a rendered algebra problem, and an end-to-end MATH-500 evaluation pipeline.
What it assumes
Assumes text generation and answer-checking utilities, while demonstrating the prompt-rendering step explicitly.
What you can do after
Apply it via Python to render prompts, generate responses, extract answers, and measure accuracy across math examples.
How it connects
Connects prompt templates with model evaluation, answer extraction, mathematical equivalence checking, reasoning models, and the MATH-500 dataset.

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This explainer was generated by Manning's knowledge graph from the text of Build a Reasoning Model (From Scratch). The section links point to the parts of the book it draws on.