1. Calculate the monthly water and electricity bill by yourself.
2. Calculate how many floor tiles are used to pave the floor, how much paint to buy for painting the walls and roofs, and how much material costs are needed by interior decorators.
3. In Arbor Day activities, calculate the row spacing and plant spacing according to the planting area and the number of saplings.
4. The approximate area of the school playground, the approximate weight of an object (a bag of salt, some apples, a bottle of ink, etc. ), and the estimated height of people or things.
5. Help parents calculate the interest on bank deposits.
6. Go out to travel, help parents design travel routes and calculate the time.