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10. Tenths and Hundredths
What was the length of the smallest pencil you have used?
How long is the pencil? Guess______cm
Measure it using a scale. How good is your guess?
We can see that Anju used a lens to make it look bigger.
We also call onetenth of a centimeter as 0.1 centimeter. We read it as ‘Zero point one centimeter.'
So one millimeter is the same as 0.1cm.
 What is the length of this pencil? mm.
What is its length in centimetres?cm.
Frogs
Have you seen frogs? Where? How many different types of frogs have you seen? Are all the frogs of the same length? Here are two interesting examples.
Gold Frogs
This kind of frog is among the smallest in the world. Its length is only 0.9 cm ! Guess how many such frogs can sit on your little finger!
Bull Frog
But this is among the biggest frogs. It is as long as 30.5 cm!
What does 0.9 cm mean? It is the same as millimetres. We can also say this is ninetenths of a cm. Right?
So 30.5 cm is the same as cm and millimetre.
About how many of the big frogs will fit on the 1m scale?
If they sit in a straight line about how many of the small frogs will cover 1m?
Guess and Colour
First colour the rods as shown, without measuring! Then check.
Rods of length less than 1 cm  Red
Rods of length between1 cm and 2 cm  Blue
Rods of length between 2 cm and 3 cm  Green
Rods of length between 3 cm and 4 cm  Orange
Guess, Draw and Measure
Guess the lengths to draw these things. Ask your friend to draw the same. After you make the drawing use a scale to measure the length. Whose drawing showed a better guess?
The Longest Rupee Notes?
What is the length of a 100 rupee note? Guess.Now measure it using a scale.
Now guess the length and width of many other things. Measure and find the difference between your measure and your guess.
At the Market
 How many paise does a matchbox cost?
 How many matchboxes can be got for Rs 2.50?
 How many rupees does the soap cost?
 Arun wanted to buy a soap. He has a fiverupee coin, 2 onerupee coins and 4 halfrupee coins. Write in rupees what money he will get back.

 An egg costs two and a half eggs. You can buy pens rupees. How much will one and a half dozen cost?
 How many pens can Kannan buy?
How much money is left?
 An egg costs two and a half eggs. You can buy pens rupees. How much will one and a half dozen cost?
 The price of two pens is Rs .
Can she buy two pens?.
Colourful Design
What part of this sheet is coloured blue? /10
What part of the sheet is green?
Which colour covers 0.2 of the sheet?
Now look at the second sheet. Each strip is divided into 10 equal boxes. How many boxes are there in all?
Is each box 1/100 part of the sheet?
How many blue boxes are there?
Is blue equal to 10/100 of the sheet? We saw that blue is also equal to 1/10 of the sheet. We wrote it as 0.1 of the sheet.
Can we say 10/100 = 1/10 = 0.10 = 0.1?
Think: Can we write ten paise as 0.1 of a rupee?
How many boxes are red? What part of the sheet is this? 15/
Can we also write it as 0.15 of the sheet ?
(Hint: remember we wrote 99 paise as 0.99 rupee!)
Now 3/100 of the sheet is black. We can say 0. sheet is black.
How many white boxes are there in the sheet?
What part of the second sheet is white?
 Make your designs.
Sports Day
The school at Malappuram has its sports day.
The first five children in the Long Jump are:
Who is the winner in the long jump?
Write the names of the I, II and III winners on this stand.
Write in Metres
How Big Can You Get
 Difference in size:m.
Do this for yourself and find the difference  What is Dinesh's height in metres?
mcm.