math
2nd Grade - Units of measurement

2nd Grade lesson

3 - Metric System of Measurement


Measure of length

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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.
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To get good marks in Maths, you should come on this website ten minutes every day.


Measure of mass

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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.
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To measure chemical products, chemists often use milliliters.






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Units of measurement

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