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Instructions for Pupils
1. 
2. Tap the 
and 
Read the number sentence. Is 8 a reasonable answer? How do you know?
3. You can or use the 
to help while you explain.
4. 
Teacher Notes (not visible to pupils)
In Texas students are required to explain or justify their answers to addition and subtraction problems. I use problems like this during my math meeting to give opportunities to practice this skill.
