Explain how you know what number is missing in the equation 3,947 = 3,000 + +40+7

900

Step-by-step explanation:

I'm gonna define the "missing number" as X, so it's easier.

3947 = 3000 + 40 + 7 + X

First, add all the numbers

3947 = 3047 + X

Now you've got that, to get the X value you've to leave X alone in a side of the equatioin, in our case we can subtract 3047 from each side. What ever you do in a side you've to do it the same at the other one.

3947 - 3047 = 3047 - 3047 + X

900 = X

Now we know the missing number is 900. Not sure about it? replace every X in the first equation with 900.

3000 + 40 + 7 + 900 = 3947, and that's correct.

1)is not similar since corresponding sides are not in the same ratio

2)are similar since corresponding sides are in the same ratio and corresponding angles are equal

hope it will

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