Ten interesting problems in first-grade mathematics
1, 7 lambs play hide-and-seek and have found 3 lambs. How many lambs are still missing?
2. Suppose 1=4 2=8 3= 16 4=?
3. Eight candles were lit on the table, five were blown out, how many are left?
4. Mental arithmetic: add 40 to 1000, add 1000, add 30, add 1000, now add 20, now add 1000, what's the total?
There are 9 lights in the classroom. Three Lamps District has gone out. How many lights are left?
6. 1 steamed buns take 3 minutes. How many minutes does it take to steam 5 steamed buns?
7. You passed the second place in the competition. Where are you?
8. Three people drink three bottles of water in three days, and how many bottles do nine people drink in nine days?
9. You took part in the competition. You passed the last one. Where are you from?
The sum of 10, minuend and drinking difference is 16. What is the value of the minuend?
The Solution of Elevator Trip in Primary School Olympic Mathematics
The elevator problem in primary school Olympic math problem is actually a complicated travel problem. Let's take a look at the basic problem-solving ideas of elevator trip in primary schools.
There are two points to note. First of all, "total travel = the number of visible parts of the elevator?" Elevator operation series ",second, in the case of the same person getting up and down, it conforms to the speed relationship of running water. (Pay attention to the total travel or the visible part series of the elevator? Elevator operation series)
The escalator in the shopping center runs at a constant speed from bottom to top. Two children walk up and down the escalator. The girl walks up from the bottom and the boy walks down from the top. As a result, the girl walked 40 steps upstairs and the boy walked 80 steps downstairs. If boys walk twice as many steps per unit time as girls, how many steps can you see when the escalator is stationary?