# Addition and Subtraction - Balance Equations - within 100

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Consider the equation:

91 – __ = 7 + 74

Let's identify the missing number that makes the equation true.

To identify the missing number, first we need to add 7 + 74:

91 – ? = 7 + 74

91 – ? = 81

Now, to find the missing number we need to calculate 91 – 81.

91 – 81 = 10

91 – 10 = 7 + 74

So, the missing number is 10.

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### Help

##### Remember :

The smallest number is the one that comes first while counting.

##### Solution :

To arrange the given numbers in order from smallest to greatest, find the smallest number among all the given numbers.

21,27,23

21 is the smallest number.