Question 51584: my son has a problem like this to figure it out what is the missing number
-1, ?, -3 1/2, ?, -6, -7 1/4, ?, ?.
Answer by Earlsdon(6294)   (Show Source):
You can put this solution on YOUR website! Provide the missing numbers:
-1, ?, -3 1/2, ?, -6, -7 1/4, ?, ?,
First, you'll notice that the numbers are getting smaller (more negative) so it is possible that subtraction involved.
You can test this on the two adjacent numbers in the set...-6, and -7 1/4
You can see that if you subtract -7 1/4 from -6 you'll get a difference of
1 1/4.
So, if you subtract 1 1/4 from the first number (-1) you'll get -2 1/4
Now subtract 1 1/4 from -2 1/4 and you'll get -3 1/2...so it seem to work with a common difference of 1 1/4
The missing numbers are:
-2 1/4, -4 3/4, -8 1/2, -9 3/4.
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