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Instructions for Pupils
Tap 
to add to student journal
Hit 
to create number line
Tap 
Where do you start?
Tap 
to explain How did counting back help to solve the subtraction problem?
Teacher Notes (not visible to pupils)
Listen and look for how the student uses the number line. Do they use an open number line and count back? Do they recognize the fact family and count on from 5 to discover missing number 4.
