AAP understands Mr Daley was referring to grants given to TAFE by the government each year.
NSW Treasurer Dominic Perrottet noted in a tweet that independent costings by the Parliamentary Budget Office showed Labor was planning to invest just over $25 million over four years.
Labor's own policy is costed at $64.5 million over forward estimates.
Mr Daley also could not remember the exact figure his party would spend on schools - a key Labor policy - under Gonski funding, before coming back later in the forum to say NSW Labor would spend about $2.7 billion.
NSW Labor's policy announcement said this sum would be over the life of the current state and federal funding agreement due to end in 2027.
The PBO's costing for the policy is just over $169 million over four years, Mr Perrottet tweeted.
At the end of the forum, 50 per cent of voters were more likely to vote for Ms Berejiklian.
Some 25 per cent were more likely to vote for Mr Daley, while a further 25 per cent were still undecided.
Video footage emerged on Monday of Mr Daley telling a Blue Mountains pub forum last year that highly-skilled Asian migrants were forcing Australian-born workers to "flee" Sydney.
The Labor leader admitted on Tuesday he could have used better language when discussing the issue of housing affordability and apologised if anyone was offended.
"I'm not (a racist), I never have been, people who know me know that I'm not," Mr Daley told reporters on Wednesday.
"I did use words that I shouldn't have, I accept that and my apology is unqualified."
When asked if the opposition leader's remark was racist, Ms Berejiklian told AAP "absolutely it was".
A worried NSW Labor party ran full-page ads featuring Mr Daley and his family on the front of several Chinese language newspapers on Wednesday.
A recent opinion poll suggests the premier is narrowly leading Mr Daley 38 per cent to 36 on a preferred leader basis.
The YouGov-Galaxy survey, published by the Daily Telegraph, indicates the major parties are split at 50 per cent each on a two-party preferred basis.