# Unit conversion - practice problems

The International System of Units (SI) is the standard system of units used in most countries around the world. It is based on seven base units: the meter for length, the kilogram for mass, the second for time, the ampere for electric current, the kelvin for temperature, the mole for amount of substance, and the candela for luminous intensity. These units can be converted to other units using conversion factors, such as the relationship between meters and centimeters (1 meter = 100 centimeters). Other common SI unit conversions include:1 liter = 1000 milliliters

1 gram = 1000 milligrams

1 joule = 1 watt-second

1 newton = 1 kilogram-meter per second squared

In the SI system, units can be multiplied or divided by powers of ten to create larger or smaller units. These multiples are called prefixes. The most common prefixes and their meanings are:

mega- (M) = 1,000,000 (e.g. 1 megahertz = 1,000,000 hertz)

kilo- (k) = 1000 (e.g. 1 kilogram = 1000 grams)

centi- (c) = 0.01 (e.g. 1 centimeter = 0.01 meters)

milli- (m) = 0.001 (e.g. 1 milliliter = 0.001 liters)

micro- (µ) = 0.000001 (e.g. 1 microgram = 0.000001 grams)

nano- (n) = 0.000000001 (e.g. 1 nanosecond = 0.000000001 seconds)

It is important to note that, when using these prefixes, the prefix should be written before the unit symbol.

#### Number of problems found: 1919

- Conversion of units

Complete the following length of data - Clock

How many hours are 15 days? - Hours

How many hours are 7 days? - Customary length

Convert length 65yd 2 ft to ft - Pound2kilos

How many pounds equal 1 kilogram? - Speed of light

Calculate the speed of light if a distance of 3000 km travels in 0.01 s. - One hectare

How many square meters are one hectare? - The shop

The shop has three hectoliters of water. How many liter bottles is it? - 1000km 5469

1000km, how much is cm? - Express 66

Express 6 whole 7/10 hours in minutes. - The speed 2

The speed of an electric locomotive is 90 km/h. Express this speed in m/s. - Area of rectangle

Calculate the rectangle area in square meters with dimensions a = 80dm and b = 160dm. - Time

16.2 days ..... how many hours is it? - Fan

The fan has a speed of 210 RPM. Calculate for the time of one fan period. - Degrees to radians

Convert magnitude of the angle α = 502°47'25" to radians: - 1000000 4135

1000000 seconds. How many days is it? - Temperature conversion

The average human body temperature is 98.6 degrees Fahrenheit. What is the temperature in degrees Celcius? - Weeks

38 weeks is equal to how many days? - Area

Calculate: x = 1 m² + 1 dm² + 1 cm² - Half-hour

How many minutes are in 1/2h (in a half hour)?

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