Help with GCSE maths please!!

(10 Posts)
justanothermnuser Tue 27-Sep-16 22:17:50

Hi all!

I'm re-taking GCSE maths after doing Level 1 & 2 Functional Skills as I've always struggled with maths! Now I've got homework and need help! Which are the odd numbers out of these lists and why? I've got the first one figured so not included it but please help me!

21, 35, 62, 84
24, 46, 84, 132
18, 32, 48, 90
16, 27, 54, 81

Thanks in advance! flowers

Akire Tue 27-Sep-16 22:21:44

Odd numbers can't be divided by 2. Even numbers can, you should be able to work out now?

OhYouBadBadKitten Tue 27-Sep-16 22:21:51

odd numbers are any number ending in 1,3,5,7, 9 You don't need to look at anything other than the last number.

Gingernaut Tue 27-Sep-16 22:27:01

Number 1 the odd number out is 62. The rest are multiples of 7

Icouldbeknitting Tue 27-Sep-16 22:28:02

I don't think this is an odd/even question - this is an "odd one out" question.

In the first one, 21 is 3*7
35 is 5*7
62 isn't any multiple of 7
84 is 12*7

so 62 is the odd one out because it's not a multiple of 7.

SansaClegane Tue 27-Sep-16 22:28:45

Hum? I thought it's odd one out rather than 'odd number'?

So it's

21, 35, 62, 84 - can't be divided by 7
24, 46,84, 132 - can't be divided by 4
18, 32, 48, 90 - can't be divided by 3
16, 27, 54, 81 - can't be divided by 9

OhYouBadBadKitten Tue 27-Sep-16 22:28:46

lol!!!! that's quite funny! I'll have another look.

Gingernaut Tue 27-Sep-16 22:29:34

16 is the square of 4. 27 is the cube of 3 and 81 is the square of 9.

54 is the odd one out.

OhYouBadBadKitten Tue 27-Sep-16 22:29:40

oh yes, they are times tables questions. doh!

Gingernaut Tue 27-Sep-16 22:30:53

Oops. Forget my answer for 4. It's about multiples.

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