Winners of the Investing in Innovation (i3) competition scrambled to make a deadline to find private-sector matches for their multimillion-dollar federal awards, meeting the challenge through a mix of cash grants and donations of pricey equipment and services, and by rechanneling previous grants to new purposes. The 49 organizations selected to receive a combined $650 million in "i3" grants under the federal economic-stimulus program had until Sept. 8 to get matches equal to 20 percent of their awards, which ranged from $5 million to $50 million. The deadline rush proved exhausting for many winners, who said they spent the final days negotiating with Education Department officials or navigating individual foundations' and other organizations' rules for giving and receiving the money intended to spur innovative education.