The widely used set of standard units of measurement is known as the metric system.

We know that the most important standard unit of measure is mass or weight kilogram what we briefly write as ‘kg’. 1000th part of this kilogram is Gram what is briefly written as ‘G’.

So 1000 grams = 1 kilogram and 1 kilogram = 1000 grams

ie 1000 g = 1 kg and 1 kg = 1000 g.

This gram (g) is a very small unit of mass.

The standard unit of mass in the metric system in grams. To weigh lighter items like cookies, popcorn, etc. we use grams. To measure weights under 1 gram like medicines, we can use milligrams (mg). 1 milligram corresponds to a thousandth of a gram.

1000 milligrams (mg) = 1 gram (g)

1000 grams (g) = 1 kilogram (kg)

We use other units of mass or weight to conveniently measure the mass or weight of materials.

 1/2 of 1 kg = 500 grams 1/4 of 1 kg = 250 grams 1/5 of 1 kg = 200 grams 1/10 of 1 kg = 100 grams 1/20 of 1 kg = 50 grams or 2 x 500 grams = 1 kg or 4 x 250 grams = 1 kg or 5 x 200 grams = 1 kg or 10 x 100 grams = 1 kg or 20 x 50 grams = 1 kg So, 1kg, 500g, 250g, 200g, 100g, 50g, etc. are the different units of measurement for mass or weight.

In addition, there are the unit weights for measuring 5 kg, 10 kg, 20 kg, 50 kg and 100 kg mass. 100kg weight is called a quintal.

10 quintals is called a metric ton.

So 1 quintal = 100 kg and 100 kg = 1 quintal.

1 ton = 10 quintals = 10 x 100 kg = 1000 kg

We can say that there are three main units of mass. To weigh heavy things we use the unit metric ton (1000 kg) or quintal (100 kg) and for weighing things of our general use we use kilograms and grams. So very heavy objects are weighed in quintals and metric tons, heavy objects in kilograms and light objects in grams. We use the weights 500g, 250g, 200g, 100g, 50g, 25g etc.

Things are weighed with the help of a scale. In general, this equilibrium is called a. designated common balance. We put the weight in one pan and the objects or goods in the other pan. Common balance

Questions and answers about the unit of mass or weight:

We know that the mass of an object is measured in kilograms and grams. Kilogram is a larger unit of mass and is used to measure the weight of heavier items. Gram is used to measure lighter objects.

We also learned how to convert one unit to another. We can convert kilograms to grams by multiplying the number of kilograms by 1000. To convert grams to kilograms, we divide the number of grams by 1000.

I. Fill in the gaps:

(i) 1 kg = …………… .. g.

(ii) ( frac {1} {2} ) kg = …………… .. g.

(iii) Two 500 g weights make …………… .. kg.

(iv) To convert grams to kilograms, we have to …………… .. by 1000.

(v) To convert a higher unit into a smaller unit, we have to …………… .. by 1000.

(vi) The smallest unit of mass learned so far is …………… ..

Reply:

I. (i) 1000 g

(ii) 500 g

(iii) 1 kg

(iv) share

(v) multiply

(vi) grams

II. Convert the following:

(i) 4 kg = ………………… g

(ii) 11000 g = ………………… kg

(iii) 3000 mg = ………………… g

(iv) 35 kg = ………………… g

(v) 2000 g = ………………… kg

(vi) 6785 g = ………………… kg ………………… g

(vii) 6 g = ………………… mg

(viii) 9007 g = ………………… kg ………………… g

(iv) 8000 mg = ………………… g

(x) 12 kg 500 g = ………………… kg ………………… g

Reply:

II. (i) 4000 g

(ii) 11 kg

(iii) 3 g

(iv) 35,000 g

(v) 2 kg

(vi) 6 kg 785 g

(vii) 6000 mg

(viii) 9 kg 7 g

(iv) 8 g

(x) 12 kg 500 g

III. Assign the most suitable unit for measuring the weight to the objects. Reply:

III. (i) kilograms

(ii) grams

(iii) grams

(iv) kilograms

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