Public Practice Guide
Use this guide to see the type of reasoning MathRoutine expects for grade 2 subtraction word problems. The goal is not worksheet volume; it is helping students read the situation, choose a model, and explain why the answer fits.
What Students Practice
Reasoning Patterns
Sample Problems
These grade-specific examples show the kind of student-visible reasoning MathRoutine is designed to support: identifying the important quantities, choosing the right structure, and checking the final answer against the story.
A bus started with 42 passengers. Some passengers got off, and 27 passengers stayed on the bus. How many passengers got off?
Reasoning Strategy
Use final state subtraction: 42 - ? = 27.
AI Support Preview
Point out that the question asks for the missing change, not the final amount.
Lena read 86 pages of a book. Omar read 59 pages. How many more pages did Lena read than Omar?
Reasoning Strategy
Compare the two amounts by subtracting the smaller from the larger.
AI Support Preview
Explain that 'how many more' asks for the gap.
A store had 240 notebooks. It sold 75 in the morning and 68 in the afternoon. How many notebooks were left?
Reasoning Strategy
Subtract both sales from the starting amount.
AI Support Preview
Turn the story into a running inventory: start, sell, sell, left.
Practice Ladder
Modeled after elementary workbook expectations: make the story structure visible before moving to the number sentence.
Read the story and identify whether quantities are being joined, separated, or compared.
Represent the situation with a drawing, number sentence, or missing-part equation.
Answer in a complete unit so the student connects the number back to the story.
Assessment Signals
A guide is useful only if it clarifies what teachers and parents should look for in student work. MathRoutine tracks these signals during practice instead of treating every miss as the same mistake.
Common Mistakes
Learning Loop
A strong word problem platform should not only say right or wrong. It should notice the pattern: missed unit rate, ignored leftover, reversed comparison, wrong base percent, or equation setup error.
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Attempt
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Diagnosis
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Next practice
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