In this lesson, we will learn how to subtract either a one-digit number or a two-digit number from a two-digit number using counting back.
Q1:
Alanoud put her counter on 12 then moved it back 2 spaces.
Q2:
Omar holds up 9 fingers and starts counting down as he puts down one finger at a time. He stops when he is holding up 4 fingers.
Decide whether he was adding or subtracting by picking the number sentence that describes what he did.
Q3:
If there should be 12 counters in the given model, how many counters are missing?
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