(1)1km =1km =1000m1m =10 decimeter1decimeter =10 cm/kloc.

(2) 1 m2 = 100 square decimeter 1 square decimeter = 100 square centimeter 1 square centimeter = 100 square millimeter.

(3) 1 m3 = 1000 cubic decimeter 1 cubic decimeter = 1000 cubic centimeter 1 cubic centimeter = 1000 cubic millimeter.

(4)1t =1000 kg1kg =1000 mg =1kg = 2 kg.

(5) 1 hectare = 1 ten thousand square meters 1 mu =666.666 square meters.

(6) 1 liter = 1 cubic decimeter = 1000 ml 1 ml = 1 cubic centimeter.

(7) 1 yuan = 10 angle 1 angle = 10 point 1 yuan = 100 point.

(8) 1 century = 100 1 year = 1 February (3 1 day): 1 \ 3 \ 5 \ 7 \ 8 \/kloc-

practical application

1. When we express the weight of an object, we usually use (mass unit).

The units for measuring the weight of articles are grams, kilograms and tons.

The weight of lighter items is usually in grams and is represented by the letter g.

The weight of heavier items is usually measured in kilograms, also called kilograms, and kilograms are represented by the letter kg. 1 kg =1000g

Measure the weight of a heavy object, usually in tons. Tons are represented by the letter t. 1t= 1000kg

Tip: in the conversion of "ton" and "kilogram", converting tons into kilograms means adding three zeros at the end of the number; Converting kilograms into tons is to remove the three zeros at the end of the number.

2. The propulsion rate between adjacent mass units is 1000. 40 25 kg student weight 1 ton.

3、 1T = 1000kg 1k g = 1000g。

4. Conversion: the method of mutual conversion between units.

The mass unit rate is 1000. (adjacent)

(1) When tons are converted into kilograms and kilograms are converted into grams, tonnage or kilograms are multiplied by the ratio of 1000.

(2) Turning kilograms into tons and grams into kilograms means dividing kilograms or grams by the propulsion rate 1000.

1 ton = 1 000kg1kg =1000g

1000kg = 1 ton1000g = 1 kg

Formula: Small means big minus three zeros, and big means small plus three zeros.

For example, grams change into kilograms, kilograms change into tons and three zeros are removed, tons change into kilograms, and kilograms change into grams and three zeros are added.

Test center 1. Comparison sizes must be converted to the same units.

1kg iron = 1kg cotton 999kg <1t2kg > 980g4t > 400kg6kg < 6000t4t < 7000kg.

Test center 2, in descending order, must be transferred to the same unit.

Test center 3, the same unit directly calculates or compares the number, and different units use the same unit instead when calculating or comparing.