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What are the formulas that must be memorized in mathematics in the third grade of primary school?
The formulas that must be memorized in mathematics in the third grade of primary school are:

1, start time+time = end time

2. End Time-Start Time = Time

3. End Time-Time = Start Time

4. Work efficiency × working hours = total workload?

5. Total amount of work ÷ working hours = working efficiency?

6. Total amount of work ÷ work efficiency = working hours?

7. Number of tiles = room area/area of each tile.

8, the area of each floor tile = the area of the room, the number of floor tiles.

9. Room area = area of each floor tile × number of floor tiles.