In this lesson, we will learn how to subtract within 20 by counting back from the starting number.
Q1:
On this domino, the dots on one side are covered with a sticker, and the total number of dots is written above it.
How many dots are under the sticker on this domino?
Q2:
Michael 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:
Emma put her counter on 12 then moved it back 2 spaces.
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