Unit conversion

(1) 1 kilometer = 1 kilometer 1 kilometer = 1000 meters 1 meter = 10 decimeters 1 decimeter = 10 centimeters 1 centimeter = 10 millimeters

(2) 1 square meter = 100 square decimeters 1 square decimeter = 100 square centimeters 1 square centimeters = 100 square millimeters

(3) 1 cubic meter = 1000 cubic decimeters 1 Cubic decimeter = 1000 cubic centimeters 1 cubic centimeter = 1000 cubic millimeters

(4) 1 ton = 1000 kilograms 1 kilogram = 1000 grams = 1 kilogram = 2 catties

(5 )1 hectare = 10,000 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 cents 1 cent = 10 cents 1 yuan = 100 cents

(8) 1 century = 100 years 1 year = 12 months A big month (31 days) has: 1\3\5\7\ The small months (30 days) of August, October, and December are: April, June, September, and November, February 28 in an ordinary year, February 29 in a leap year, 365 days in an ordinary year, 366 days in a leap year, 1 day = 24 hours 1 hour = 60 minutes 1 minute = 60 seconds 1 hour = 3600 seconds?

Practical Application

1. When we express how heavy an object is, we usually use (mass unit) .

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

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

To measure the weight of heavier items, kilograms are usually used as units, also called kilograms. Kilograms are represented by the letters kg. 1kg=1000g

The weight of heavy items is usually measured in tons. Tons are represented by the letter t. 1t=1000kg

Tips: In the conversion of "tons" and "kilograms", to convert tons to kilograms, add three zeros at the end of the number; to convert kilograms to tons, add Remove 3 zeros from the end of the number.

2. The rate of progress between adjacent mass units is 1000. 40 students weighing 25 kg weigh 1 ton.

3. 1T=1000kg 1kg=1000g.

4. Conversion: Method of converting units to each other

The mass unit conversion rate is 1000. (Adjacent)

(1) To convert tons into kilograms and kilograms into grams, multiply the number of tons or kilograms by 1000.

(2) To convert kilograms into tons and grams into kilograms, divide the number of kilograms or grams by the rate of 1,000.

1 ton = 1000 kilograms 1 kilogram = 1000 grams

1000 kilograms = 1 ton 1000 grams = 1 kilogram

Rule: Subtract three zeros for small changes. , change big to small and add three 0s

For example: change grams into kilograms and kilograms into tons and remove 3 0s, change tons into kilograms and kilograms into grams and add 3 0s.

Test point 1. Comparing sizes must be converted into the same unit

1 kilogram of iron = 1 kilogram of cotton 999 kilograms <1 ton 2 kilograms>980 grams 4 tons>400 kilograms 6 kilograms <6000 tons 4 Ton <7000 kilograms

Test point 2. Must be converted into the same unit in order from largest to smallest

Test point 3. The units are the same and the numbers are directly calculated or compared. If the units are different, replace them with the same units. Units are being calculated or compared.