Mina has 18 stickers. Her cousin gives her some more, and now she has 31 stickers. How many stickers did her cousin give her?
Reasoning strategy
Set up the unknown addend: 18 + ? = 31.
Difficulty Practice Guide
Medium Grade 6 Addition Word Problems
This page shows what medium practice should demand for grade 6 addition word problems. The goal is not a larger worksheet. The goal is to make the student's reasoning visible enough to choose the next better problem.
What Changes At This Difficulty
Add one meaningful reasoning layer so students must plan before calculating.
Expected structure: 2-3 step problem solving.
Vocabulary load: high with intentional distractors.
Reasoning depth: at least 2 relationship layers.
Student Work Signals
A good medium problem should expose the bottleneck
MathRoutine watches for whether the student understood the situation, wrote a useful setup, handled the calculation, and answered the exact question asked.
1
separate useful numbers from background details
2
complete a two-step setup
3
interpret the result with the correct unit
Sample Problems
Three classes collected 124, 138, and 119 cans for recycling. How many cans did they collect altogether?
Reasoning strategy
Add all three parts and check place value carefully.
Why This Matters
The paid value is diagnosis, not answer lookup
Basic gives repeated targeted practice. Pro becomes useful when the student needs help understanding wording, recovering the setup, or seeing the same misconception return across attempts.
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