In order to find $$4 \times 7$$, Tim turned multiplication into an addition operation. Look closely, and follow his method to calculate $$9 \times 5$$.  $$4 \times 7=7+7+7+7=28$$  $$4\times 7 = 4 + 4 + 4 + 4 + 4 + 4 + 4 = 28$$ 
Overseas Competition->Knowledge Point->Calculation Modules->Whole Numbers->Whole Numbers Multiplication and Division