Alberta NDP Leader Rachel Notley poked fun at one of her United Conservative Party opponents on Tuesday, after he criticized the party鈥檚 mathematics policy in a tweet that didn鈥檛 quite add up.

鈥42% has become acceptable as a passing great (sic). Let that sink in,鈥 tweeted UCP candidate for Cypress鈥擬edicine Hat. 鈥淭hat means it has become acceptable for children to not know 68% of the material they are taught in school,鈥 he went on.

Notley tweeted back: 鈥淣ot gonna say it... not gonna say it... not gonna say it,鈥 and then added, 鈥淔ine. I鈥檒l say it. Math is hard.鈥

Her response was a joke that many Albertans will get. The late Progressive Conservative Leader Jim Prentice turned to Notley during a 2015 election debate while discussing her corporate tax rate proposal and said 鈥淚 know that math is difficult.鈥 He was accused of sexism and later lost the race.

Barnes鈥 comment was highlighting the fact that Alberta鈥檚 standardized Grade 9 math tests only required a score of 42 per cent to be considered a pass in 2017-18. Alberta鈥檚 NDP education minister said at the time that the score had changed to account for a more difficult test.

Barnes鈥 gaffe came just as UCP Leader Jason Kenney was unveiling the party鈥檚 education platform. Kenney has vowed to put more emphasis to standardized testing by making diploma exams worth half of secondary students鈥 final grades, up from the current 30 per cent.

Notley鈥檚 NDP hasn鈥檛 released an education platform but she has said the party would continue to build and modernize schools and add new funding to hire teachers as populations grow.

Albertans go to the polls on April 16.