2nd Grade - Units of measurement

# 3 - Metric System of Measurement

## Measure of length

 The nearest star is at a distance of 37 800 000 000 000 kilometers from the Earth. To measure a length, you can use the millimeter (mm), the centimeter (cm), decimeter (dm), meter (m), or kilometer (km). In a kilometer there are 1000 meters, in a meter there are 10 decimeters, in a decimeter there are 10 centimeters, and in a centimeter there are 10 millimeters. The distance between New York and London is 5600 kilometers. Un very big step measures about 1 meter, a pencil measures bout 1 decimeter, the top of the pencil measures 1 centimeter, the lead of the pencil measures 1 millimeter.

## Measure of time

 To measure durations in time, you can use the second, the minute, the hour, the day, the week, the month, the year. In a year there are 365 or 366 days, in a week there are 7 days, in a day there are 24 hours, in an hour there are 60 minutes and in each minute there are 60 seconds. To get good marks in Maths, you should come on this website ten minutes every day.

## Measure of mass

 The Earth weights 6 000 000 000 000 000 000 000 tons. To know how much a thing weights, you can use grams or kilograms. If the object is very light, you can use the gram (a sheet of paper weights about 2 grams). If it is heavier you can use kilograms. A 8-year-old child weights between 30 and 35 kilograms. If the object is very heavy you can use tons. In a ton there are 1000 kilograms. A car weights a ton and an elephant 5 tons.

## Measure of volume

 To measure liquids you can use liter, deciliter, centiliter, milliliter. In a liter there are 10 deciliters, in a deciliters there are 10 centiliters, and in a centiliter there are 10 millimeters. A bottle of milk contains 1 liter of milk. A mug of milk contains about 2 deciliters of milk. You can also say 20 centiliters. To measure chemical products, chemists often use milliliters.

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Units of measurement

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