The Prime Minister has said that today's just-released GDP figures show that "our economy is still growing" and that "we can't take the recovery for granted".
GDP figures show our economy is still growing, but we can't take the recovery for granted. Don't risk it with Ed Miliband and the SNP.
Mr Cameron was responding to figures showing slower economic growth in the first quarter of 2015 than in the last three months of 2014.
After the ONS released slower-than-expected figures on Britain's economic growth, George Osborne has insisted that the "future of the economy is on the ballot paper".
GDP figures show future of the economy is on the ballot paper. We should stick to the plan that's delivering a brighter more secure future
Figures show that the economy grew by 0.3% in the first quarter of 2015 - half as much as the 0.6% it grew between October and December 2014
With rising instability abroad, now is worst possible time to vote for instability at home.
The UK economy grew by 0.3% during the first quarter of 2015, the Office for National Statistics said today.
Official figures released today are expected to show that the UK economy's growth slowed down in the first three months of 2015.
GDP rose by 0.6% in the last quarter of 2014, but economists say they expect the figure to be around 0.5% between January and March this year.
Some experts blame this on the global fall in oil prices, while construction has shrunk and exports are also down.
The Bank of England has kept interest rates on hold at 0.5%.
The scale of its quantitative easing programme to boost the money supply remains unchanged at £375 billion.
The UK inflation rate fell to 0.3% in January - the lowest annual rate on record, official figures show.
The rate of Retail Price Index inflation also fell to 1.1% from 1.6% the previous month.
The Office for National Statistics said falling prices for food and fuel were the main factors behind the drop.
ITV News Economics Editor Richard Edgar said the 0.9% fall in inflation over the past year is the largest since 2001.
The fall in inflation over the past year - 0.9% - is the largest since 2001
Nick Clegg has hailed government plans for a £5billion regional pot as opening a new era for England's regions.
"This is something that turns a page of decades, generations of over-centralised bossiness from Whitehall," the Deputy Prime Minister told Good Morning Britain.
"I'm really excited because you just get a lot more bang for your buck."
The shadow business secretary has dismissed an extra £5 billion spending on regional growth as falling "far short" of Labour plans.
Labour MP Chuka Umunna said that the Conservative-led coalition had failed to deliver on promises to rebalance England's economy and ensure growth was not concentrated in the capital.
"Instead we've seen things go into reverse as regions and local areas have been held back," he said.
He said that a Labour Government would allow regional authorities to take over £30 billion of spending across the country.
The prime minister David Cameron has said that an extra £5 billion in investment for England's regions over the next five years will help to kick-start growth across theUK outside of the capital.
"For too long our economy has been too London-focused and too centralised. Growth deals will help change all that," he said.
He said that the scheme could turn regional towns and cities in economic "powerhouses" and create thousands of new jobs. "
Deputy Prime Minister Nick Clegg, who chairs the local growth cabinet committee, also hailed the announcement as marking the end of a culture of "Whitehall knows best" and helping to end an over-reliance on the banks and the City of London.
England's regions are set to benefit from an extra £5 billion in investment under Government plans to re-balance the country's economy and create thousands of new jobs outside the capital.
The cash will be allocated to local authorities and businesses through a series of local "growth deals" for investment in projects including building new homes, improving transport links and opening up new training opportunities.
Officials said that the funding, which would be released over five years from 2015, would lead to work on over 150 roads, 150 housing developments and 20 stations as well as create new jobs and training opportunities outside the capital.