Posted by Peter on 29th November 2011

KS2 Maths SAT question 25 from 2010 Paper A

Sarah had a bag of cherries…..Question 25 is one of those questions where you have to read it all carefully before starting and then proceed from the end, working backwards.

Suggested method:

The key to answering this question is to start at the end and work backwards.
Amy got 2 cherries.
Liam gave half of what he had left to Amy, so Liam must have had 4 left.
Liam had eaten 5 of his cherries so he must have had 5 + 4 = 9 cherries.
Sarah gave half of what she had left to Liam. This was 9 so she must have had 18 left.
Sarah had eaten 5 cherries so she must have had 5 + 18 = 23 cherries to start with.

The answer is   23
Two marks for this question.

If the answer is incorrect one mark can be given for showing appropriate working out, such as
2 x 2 = 4          4 + 5 = 9          9 x 2 = wrong answer of 16              16 + 5 = wrong answer of 21.
The working out must be carried through to reach an answer.

This is very much at the level 5 end of the paper, so correct marks here could just make the difference between Level 4 and level 5.

Question 25 from SATs Paper A 2010

Question 25 answer and suggested method

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