Eligibility for free school meals (FSM) is used as a key measure of poverty.
Peru is trying to extend the provision of free school meals to cover family members.
This compared with a rate of 65% among pupils who were not entitled to free school meals.
It has protected free school meals and cut the ratio between its highest and lowest paid staff.
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Pupils who receive free school meals and those who cannot travel independently will still be entitled to free transport.
Among children on free school meals nearly 72% reached Level 2 in reading and 64% did so in writing.
But there have been previous assessments of pilot projects for free school meals.
Mr Blunkett said that there were significant differences between schools with high numbers of pupils entitled to free school meals.
Just 60% of white British boys on free school meals reached that level, while 68% of black British boys did so.
About half of the school's pupils are entitled to free school meals.
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In Reading, nearly a fifth of all children receive free school meals.
In contrast, 19% of pupils not on free school meals did not take English literature GCSE last year, up from 14% in 2003.
It means that schools with large numbers of pupils on free school meals will receive more money but other schools will get less.
But these changes will have a knock-on effect for devolved services such as social care and devolved entitlements such as free school meals.
The Scottish Borders was one of the parts of Scotland which took part in a pilot programme of free school meals in primaries.
It is given to pupils who are eligible for free school meals with the aim of closing the achievement gap between rich and poor.
The number of free school meals taken by children across Berkshire has risen by a third over two years, Department for Education figures reveal.
Other councils had not updated their information on free school meals on their websites, which meant people may not be aware they were eligible.
BBC: NEWS | Business | Poor families 'miss out on free food'
Kent County Council removed the free travel in September, with only families on maximum working tax credit and those receiving free school meals getting it.
These standards require schools and caterers to provide a daily hot meal for pupils, as well as free school meals for those that are eligible.
The association said the system prevented fraud, stopped money being lost and meant students eligible for free school meals could take them up without being stigmatised.
Last year almost two thirds of free school meals children at Trinity High achieved five good grades at GCSE, outperforming the national average for all children.
It leaves some discretionary funding in place, such as free transport for pupils on free school meals, and a subsidy for other pupils who will be affected.
Free school meals have long been a measure of a disadvantaged childhood, but the coalition government has attached extra funding to each child registered for the meals.
Mr Twigg said that white working class pupils on free school meals were the worst performers, with fewer than 30% achieving five good GCSEs, including English and maths.
Some 20% of the intake are on free school meals, an indicator of poverty often linked with poor academic performance, and 20% do not speak English at home.
Free school meals are a standard poverty indicator - used by the inspectorate, Ofsted, to judge how well one school is doing compared with others "in similar circumstances".
BBC: NEWS | Business | Poor families 'miss out on free food'
Last year just 66% of those known to be eligible for free school meals reached the expected level in English and maths, compared with 82% of all other pupils.
She has been developing her own indicators, working with schools and local education authorities, using such things as entitlement to free school meals and families' take-up of grants for school uniforms.
The pupil premium has helped to a certain extent but as only around one in 10 students get free school meals, the funding hasn't been enough to compensate for the shortfall.
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