Addition Sentences Within 20
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Let's write the addition sentence represented by the picture shown below:
Count the number of objects in all the boxes.
This picture shows 7 + 8 = 15.
So, the addition sentence represented by the given picture is 7 + 8 = 15.
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The correct answer is
The smallest number is the one that comes first while counting.
To arrange the given numbers in order from smallest to greatest, find the smallest number among all the given numbers.
21 is the smallest number.