Every subject has its own learning method, but in fact it is always inseparable from it, basically inseparable from memorization, memorization and practice. As one of the most brain-burning subjects, so is mathematics. Here are some second-grade math knowledge points I have compiled for you, hoping to help you.

Knowledge points of "knowing time" in the first volume of second grade mathematics

1, know the time

(1) There are an hour hand and a minute hand on the clock face, which walk fast and the minute hand is long; Walk slowly, the shorter the hour hand;

(2) There are 12 large squares, 60 small squares and 1 large square with 5 small squares on the clock face. Walk clockwise 1 hour and walk in minutes.

(3) It takes one lap to walk clockwise 1, so 1 =60 minutes;

(4) Half an hour =30 minutes, and a quarter of an hour = 15 minutes.

(5) Time reading and writing: for example, 3: 30, which can be read as 3: 30 or 3: 30; 8: 05, you should write 8: 05.

2. Solve problems with knowledge

(1) events should be arranged in chronological order, and the time cannot be repeated.

(2) When asked what time it is in a few minutes, read out what time it is now, and then calculate what time it is in a few minutes.

(3) The hours when the hour hand and the minute hand can form a right angle are 3 o'clock and 9 o'clock.

Knowledge points of "understanding direction" in the second grade of primary school mathematics

First, in the opposite direction:

East-west

north-south

Northeast-southwest

Southeast-northwest

Second, determine the center and find the right direction-the key to solving this kind of problem is to find out who is the center.

1, get up in the morning, facing the sun, the front is (east), the back is (west), the left is (north), and the right is (south).

Facing the sunset, your front is (west), your back is (east), your left is (south), and your right is (north).

Facing the north, your front is (North), your back is (South), your left is (West) and your right is (East).

Facing south, your front is (south), your back is (north), your left is (east), and your right is (west).

Summary of important knowledge points of mathematics in the second grade of primary school

First, hybrid computing

Mixed operation, multiply first, then divide, then add and subtract. If there are brackets, count them first. Only addition, subtraction, multiplication and division should be calculated from left to right.

Second, solve the practical problems of two-step calculation.

1, think about what problems to solve first, and then what problems to solve.

2, you can draw pictures to help analyze.

3. It can be distributed computing or integrated computing.

Unit of length: the unit of length refers to the basic unit for measuring spatial distance, which is formulated by human beings to standardize the length.

Its international unit is "meter" (m), and commonly used units are millimeter (mm), centimeter (cm), decimeter (dm), kilometer (km) and so on. Length units play an important role in various fields.

Meter: The standard unit of length in the international system of units is "meter", which is represented by the symbol "m".

Decimeter: dm is one of the metric units of length, and 1 decimeter is equivalent to one tenth of 1 meter.

Centimeter: unit of length, abbreviated as centimeter.

Millimeter: English abbreviation for mm

(1 cm = 10/0mm =0. 1 decimeter =0.0 1 m =0.0000 1 km)

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