Expressing Fractions KS2 Tests

Discussion in 'Primary' started by nick909, Mar 5, 2019.

1. nick909Star commenter

Hi all, apologies if this has been answered on here before. I've had a few years reprieve from Y6 but am back this year and am struggling to get a clear answer - no-one agrees in my place.

Do fraction answers to the KS2 tests need to be expressed in simplest form/as mixed numbers to be marked correct?

I obviously encourage the children as much as possible to do this as a matter of course, but the odd one occasionally doesn't, and I've always maintained that the answers are still correct (because they are)!

Is there a clear cut understanding of this?

2. StiltskinStar commenter

From the 2018 mark scheme General marking principles -
The answer is numerically or algebraically equivalent to the answer in the mark scheme. -

For fraction answers that can be expressed as a mixed number, the fraction paired with the integer must be a proper fraction, e.g. 1 6/4 will not be awarded the mark although method marks may still be available.

In the mark scheme it shows that equivalent fractions are acceptable (e.g. q24 of paper 1), If a simple form is required the question should state this.

nick909 likes this.

Many thanks.

4. modgepodgeEstablished commenter

I think any equivalent is acceptable in the arithmetic (as outlined above), but in the reasoning it may specify ‘in its simplest form’ in which case obviously it must be simplified.

I seem to remember a question a couple of years ago which was something like 3/4 of 240 or 3/4 x 240 where it specifically said that 720/4 was NOT acceptable. But I could be getting muddled and misremembering.

In the KS2 SATS Paper 1 (Calculation), the mark scheme will accept equivalent fractions so long as they are proper fractions, e.g. both 2/5 and 4/10s would be acceptable. Students can simplify if they want, but they do not have to.
BUT
They do not accept improper fractions e.g. 10/6. They would expect this to be written as 1 4/6 (one and four sixths). They could simplify this to 1 2/3 but this is not compulsory.

6. WBSenior commenter

If the question does not specify the format of the answer then any equivalent answer is acceptable. The kids need to read the question and then answer it... that's a whole other world of pain!

7. modgepodgeEstablished commenter

Not true, for example question 35 last year the mark scheme gives both a mixed number and an improper fraction as acceptable answers.

8. TheBigPickleNew commenter

My understanding from teaching this scenario in Year 6 is that the question will specify if an equivalent, mixed number or the simplest form is desired in the answer.

Thanks for the correction, Modgepodge!

10. ChrisKitsiouNew commenter

I'll keep my question brief. 2018 ks2 sats maths paper 1.

Q33) 1 1/2 x 40 =

Why was 120/2 not accepted when in other fractions questions any equivalent is completely fine?
We had children who converted 1 1/2 into 3/2 and then solved it as you would do on a regular multiplication of fractions question.

11. MilgodEstablished commenter

Any equivalent will be accepted. However, if the fraction can make a whole number like 120/2 then you have to write the whole number.

12. modgepodgeEstablished commenter

I think this is the question I referred to in post #4. I also can’t understand why he improper fraction would not be acceptable. Milgod’s explanation makes some sense I suppose, though it seems unfair. They clearly know how to multiply fractions but get no credit for it.

13. MilgodEstablished commenter

It is unfair. We argued it for some on the 2016 papers but appeals got rejected. Ho hum.

14. ChrisKitsiouNew commenter

Milgod- so why is 60/1 an acceptable answer then but 120/2 isn't?

15. MilgodEstablished commenter

What question/paper was 60/1 on?

16. ChrisKitsiouNew commenter

Pretty sure it was 2018 ks2 sats maths paper 1.

Q33) 1 1/2 x 40 =

60 or 60/1 was accepted but not 120/2