1: When you go to the vegetable market to buy food, you need to ask the unit price first, then weigh the final total price and use simple multiplication;

2: Use subtraction when looking for money;

3. For example, how many boys and girls are in your class, and what is the ratio;

4. walking to school and the time to go to school by bike;

5: How many kilowatt hours do you use to watch TV every month?