# Balance Addition Equations - Within 100

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Consider the equation:

35 + 12 = __ + 40

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

To find the missing number, first we need to add 35 + 12:

35 + 12   =     ? + 40

47            =     ? + 40

Now, let’s look for the number which when added to 40 gives 47.

47 = 7 + 40

35 + 12 = 7 + 40

So, the missing number is 7.

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### Help

The correct answer is

##### 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.