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From Karnataka Open Educational Resources
→Concept #4 Place Value
==Concept #4 Place Value==
==Concept #4 Place Value==
'''I Making hundreds, tens and ones (1 period)'''
*Print 32 squares of this.
*Distribute into 8 groups of 4 children each.
*Each group will get 4 squares.
*The value of 4 squares will be 4x100 = 400
*Each group must cut the solid lines; 1 square will have 10 strips. These are tens. So each square has 10 “tens” (They can either *cut, or work without cutting – up to the children)
*Each one of those tens will have 10 ones.
*Let the children make numbers and write them down
*Ask them what is the largest number each group can make? 400 is the answer – but check if children understand this.
'''II. Abstraction from here (1 period)'''
Now let us assume children have 9 such squares.<br>
In each group, how many hundreds are possible ? – 9 <br>
In each group, how many tens are there ? – 9 x 10 = 90<br>
In each group, how many tens are there ? – 90 x 10 = 900<br>
'''1-9 ones are possible; 10 ones means one ten. Ten ones is the same as one ten'''<br>
'''1-9 tens are possible; 10 tens means one hundred. Ten tens is the same as one hundred'''.<br>
'''What happens when we have 10 hundreds? What is it the same as?'''<br>
'''What is the importance of ten? We count in groups of tens'''<br>
9+1= 10 = 10 x 1
99 + 1 = 100 = 10 x 10
999 + 1 = 1000 = 10 x 100
'''Greatest 1-digit number + 1 = Smallest 2-digit number''' <br>
'''Greatest 2-digit number + 1 = Smallest 3-digit number''' <br>
'''Greatest 3-digit number + 1 = Smallest 4-digit number''' <br>
'''Following the pattern, we can expect that, on adding 1 to the greatest 4-digit number''' <br>
'''(9999 – nine thousand nine hundred and ninety nine) we get the smallest 5-digit number''' <br>
'''(9999 + 1 = 10,000 or ten thousand). Further we can expect that 10 x 1000 = 10,000 i.e.''' <br>
'''9999 + 1 = 10,000 = 10 x 1000.''' <br>
'''Do this only when children are confident – this is for advanced students'''<br>
'''Write on the board like this:'''
'''III. Fill number line (1 period)'''
Draw these one below the other
1,2,.......<br>
10,20,.......<br>
100, 200,.....<br>
===Learning objectives===
===Learning objectives===
===Notes for teachers===
===Notes for teachers===
