The second question on page 36 of the second grade math book is a parking lot full of cars, with four rows and six parking spaces in each row. Drive away 15 cars, how many cars are left?

The solution process should be to calculate the total number of cars first, and then subtract the number of cars that have gone, which is equal to the remaining number of cars.

6×4=24,24- 15=9。 Can get the answer, it should be nine cars left. You can also list a complete formula: 6×4- 15=24- 15=9.

This is actually a multiplication operation and then an addition operation. When calculating, you should calculate multiplication first and then addition.