Using Decimals
Mahesh wanted to measure the length of his table top in metres. He had a 50 cm scale.
He found that the length of the table top was 156 cm. What will be its length in metres?
Mahesh knows that:
- We know that 1cm =
1 100 - convert the
1 100 - 156 cm =
cm + cm - converting the 56cm into m is
and add the values - convert the
56 100 m - 156 cm =
m - We have found the answer.
Expand the below line and measure the length by using scale
Can you write 4 mm in ‘cm’ using decimals?
How will you write 7cm 5 mm in ‘cm’ using decimals?
Can you now write 52 m as ‘km’ using decimals? How will you write 340 m as ‘km’ using decimals? How will you write 2008 m in ‘km’?
Mahesh also wants to represent this length pictorially. He took squared papers of equal size and divided them into 100 equal parts. He considered each small square as
Nandu bought 500g potatoes, 250g capsicum, 700g onions, 500g tomatoes, 100g ginger and 300g radish. What is the total weight of the vegetables in the bag?
Let us add the weight of all the vegetables in the bag.
- 500 g + 250 g + 700 g + 500 g + 100 g + 300 g =
g - we know that 1000 g = 1 kg
- Convert the
1 1000 - Thus, 2350 g =
g + g - Calculate 2350 g
- convert the decimals and add the values
- Hence we get the value is
- Thus, the weight of vegetables in Nandu’s bag is
kg.
Can you now write 456g as ‘kg’ using decimals?
We can write 456g as kg using decimals
1000 g =
456 g =
2. How will you write 2 kg 9 g in ‘kg’ using decimals?
2 kg 9 g = 2 kg + 9 g
2 kg +
= 2 kg +