Totally Stumped

Updated on February 07, 2012
S.E. asks from Landenberg, PA
25 answers

I can't get this one question on my daughter's homework. She's done with it knowing ehr answer is probably wrong, but it's driving me crazy!

what is the next number in the sequence 4, 2, 8, 4, 10, 5

Best guess is the next two numbers are 20 and 10...... Help?

The answer is due today. I'll be certain to let all of you know what the answer was supposed to be. The dive by 2 add 6 makes sense, but I was thrown by the decimal answer, but in retrospect it does make sense that they would allow for that...

We thought the next set of four would be a new sequence following the same pattern of multiply by two divide by two

I'll be sure to update when I find out.

2 moms found this helpful

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K.O.

answers from Atlanta on

My guess is 11 and 5.5

Pattern seems like divide by 2, add 6 (4 divided by 2 is 2 plus 6 is 8 divided by 2 is 4 plus 6 is 10 divided by 2 is 5 plus 6 is 11 divided by 2 is 5.5)

4 moms found this helpful
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A.G.

answers from Provo on

I think the pattern is...divide by two, add six, divide by two, add six...etc. which would put the next two numbers as 11 and 5 1/2. I don't know how old she is...so if working with fractions is way beyond...I may totally be wrong...but that's the only thing I can think of...12 and 6 would make more sense if there was a 6 and 3 after the 2. 20 and 10 would kind of make sense...but I have no idea how they would have gotten from the 8, 4...to the 10, 5. Anyway...just my random mathematical thoughts...there once was a day (far too long ago)...that I had a teacher that was insane about patterns...we did them ALL the time. Now it makes me tired thinking about them :p.

3 moms found this helpful
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M.B.

answers from Austin on

12 and 6.....

However, there are 2 numbers missing from that sequence.... I would think it would be 4, 2, 6, 3, 8, 4, 10, 5, 12, 6, 14, 7.......

1 mom found this helpful

More Answers

✤.J.

answers from Dover on

4/2=2, 2+6=8, 8/2=4, 4+6=10, 10/2=5, 5+6=11, 11/2=5.5
That's my best guess!

3 moms found this helpful
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S.W.

answers from Minneapolis on

My 9 year-old math whiz says it's 11 and 5.5. The pattern is - divide by two, add 6.

2 moms found this helpful
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S.H.

answers from St. Louis on

I think in order to use the "12, 6".....then "6, 3" would be included. For me, that omission rules out this formula.

The "11, 5.5" works - using the "add 6 to the last answer; divide by 2" rule. But it is an awkward solution.

& then we have the "20, 10" answer. WTHeck? I can't come up with a formula to achieve this answer!

& here's what's interesting: I had 4 people in my family look at this question. Thank you, thank you for a special family bonding moment!! We had FUN & we're still arguing over it! Please remember to update your question!

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S.B.

answers from Redding on

I was thinking 11 and 5.5. That's the pattern I'm seeing anyway.

1 mom found this helpful
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M.S.

answers from Philadelphia on

I was thinking 11 and then 5.5
(4 divided by 2 (2) + 6 is 8, 8 divided by 2 (4)+ 6 is 10, 10 divided by 2 (5) + 6 is 11?)

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D.S.

answers from San Francisco on

i guess it shd be 50 and 25..

my working: 4 2 8 4 - 4*2=8 half of which is 4

similarly, 10 5 ...the next 2 numbers shd be...10*5 = 50 and half of 50 is 25.

so 50 and 25...

pls check with ur teacher and let me know the answer...im not very sure but jus my guess!!

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V.M.

answers from Cleveland on

ok they are divided by half would it be 12, 6???

no clue sorry I would seriously love to know the right answer

but if you are doubleing the first number 4, 8 opps that wont' work i don't see where they are getting the 10

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K.M.

answers from Kansas City on

Someone have already guessed...but I think the pattern is:
divided by 2, +6, divided by 2, +6, divided by 2, +6...so the next numbers are 11 and 5.5.

A.M.

answers from Kansas City on

I agree 11 and 5.5. but it doesn't fit the sequence so I'm out!

L.B.

answers from Biloxi on

Without looking at the other answers, I would say 12, 6
Looks like the progression is by 2s - 4,8,10, with the alternating number half of those, 2,4,5.

Hence - 4,8,10,12 and 2,4,5,6

Let us know what the correct answer is please !!!

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T.H.

answers from Kansas City on

I think you are right, I got 20 and 10 also. It is very convoluted for sure and I wondered how old your daughter was too. Anyway, at least you all tried, the teacher can't be too upset about it and I'm betting that a lot of kids will probably get that one wrong! ;)

But, I did it before looking at the other answers and it looks like you and I are in the minority! LOL! So who knows!!

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S.B.

answers from Philadelphia on

I've always considered myself good at math, but this one stumped me. I googled it & found something similar. Your answer of 20 & 10 appears to be right. I'd just like to add that if it is right, it's a stupid sequence since you can't possibly figure out the number that comes after your 20,10.
The only other answer I can come up with is:
4/2 = 2
4+4=8
8/2 = 4
8 + 2 = 10
10/2 = 5
10+1 = 11
11/2 = 5.5 (but also unlikely since it includes a decimal/fraction)

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T.V.

answers from San Francisco on

What grade is your child in? When is the assignment due?

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C.C.

answers from Philadelphia on

I think it's "divide by 2, then plus 6" so the next number would be 11?

I can't tell what the decimal answer part is that you are referring to?

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K.P.

answers from Santa Fe on

Looks like the first set of 4 numbers are derivatives of each other -- 4, half of 4 = 2, twice 4 = 8, and 4 again; so I'd guess that you're right that it's 10, half of 10 = 5, twice 10 = 20, and 10 again.

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J.J.

answers from Allentown on

I was thinking 11, 5.5 too but can't wait to see the answer.

K.I.

answers from Los Angeles on

14, 7?

That's my best guess.

Because 10/2=5 and 4+10=14

I don't know? These things *always* stumped me!!

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N.B.

answers from Philadelphia on

took me a moment but it's 11
4/2 is 2
2 +6 is 8
8/4 is 4
4 +6 is 10
10/2 is 5
5 + 6 is 11 - your answer!

thanks for the brainteaser!

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R.S.

answers from Denver on

Yep, 12 6, add two, then divide by 2

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V.L.

answers from Pittsburgh on

I'd guess 14, 7 to keep out of the decimals depending on the grade.
I'll be interested to see the correct answer.

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K.C.

answers from Philadelphia on

Yeah, I thought it was 20, 10, too. Original number, half of that, double of original number, original number. Then add 6 for the next "original number"? You could certainly make a case for it...

K.L.

answers from Sacramento on

12, 6??

My brain hurts already...

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