A, length unit:

1, uniform length unit.

What are the disadvantages of measuring the longest length with a part of the human body as the unit? Because the height varies from person to person, the workmanship, feet and arms are long and short, and the measured length of the object is very inaccurate! Later, people stipulated that a certain length should be used as the unit of length. Box meters, meters, etc. are all unified units of length.

2. Know the amount of centimeters expressed in centimeters.

When measuring an object with a short basin, the length of one centimeter is usually estimated in centimeters: the width of the index finger, the width of the Tian Zi grid, the length of the thumbtack, and so on.

3. Know the amount of rice used.

The meter can be represented by m.

4. Know the line segment.

2. Addition and subtraction within100:

1, additional:

/kloc-addition of numbers within 0/00 (no carry), two-digit plus two-digit (carry plus), two-digit plus two-digit (practice class).

2, subtraction:

Subtract two digits from two digits (no abdication), subtract two digits from two digits (abdication), subtract two digits from two digits (practice class), and find more than one digit and less than one.

3. Addition, subtraction and addition and subtraction.

Third, the preliminary understanding of the angle:

A preliminary understanding of 1 and angle.

2. A preliminary understanding of right angles.

3. Acute and obtuse angles.

Four, 2~6 table multiplication:

A preliminary understanding of 1 and multiplication.

2, 2~6 multiplication formula.

V. Observation object:

Observe objects, observe three-dimensional graphics.

Six, 7~9 table multiplication:

The multiplication formula of 7~9.

Seven, know the time:

Know the time.

Eight, mathematics wide angle-collocation:

Arrange and combine.