Home Pre-Algebra Units of measurement: weight and length

Units of measurement: weight and length


Units of measurement are an important lesson in elementary school. In this article, we provide methods for how calculating weight and length.

To master this course some information about fractions is required.

Units of measurement: weights

In our daily life, to measure the weight of an object, we often use the following measure: Kg “Kilogram” and g “Gram”. But also, we can use other units of measurement like t “ton”; q “quintal”; hg “hectogram”; dag “decagram”; dg “decigram”; cg “centigram”; mg “milligram”.

Remember that the relationship between all of its measurements can help you convert weight measurements easily.

t q kg hg dag g dg cg mg

Exercise: I convert to the requested unit: 1458dag=……kg…….g?

Solution: We will use the unit table. We need to write 1458dag in the array. In reality

Kg hg dag g
1 4 5 8 0

Then we have 1458 dag= 14 Kg 580 g.

Exercise: Calculate the difference 4kg8g – 1408g =…………hg

Solution: The idea is to convert 4 kg to the corresponding weight in grams, then do the subtraction. In fact

Kg hg dag g
4 0 0 0

Then 4Kg=4000 g. This implies that 4kg8g=4008g. Now we have

4kg8g – 1408g = 4008g–1408g=2600g.

Kg hg dag g
2 6 0 0

This shows that 2600g=26 hg. Finally, 4kg8g – 1408g =26hg.

Exercise: Steve bought 65dag of blueberries and 1kg 500g of raspberries to make berry jam. Calculate the total mass of these fruits.

Solution: First we need to convert 65dag to Kg and g. In fact,

Kg hg dag g
0 6 5 0

Then 65dag= 0kg650g. The total mass of fruits is 650g+1kg500g. On the other hand, 650g+500g=1150g. We convert this weight to Kg and g as shown in the following table

Kg hg dag g
1 1 5 0

We then have 1150g= 1kg150g. Finally, the total weight is 2kg150g.

You may also consult Metric System.

Next articleElementary Mathematics: an overview