Observe that 4 - 1 = 3 and 4 - 3 = 1 i.e. 1 removed from 4 gives 3 and
this 3 removed from the same 4 gives 1.
Observe that 8 - 3 = 5 and 8 - 5 = 3 i.e. 3 removed from 8 gives 5 and
this 5 removed from the same 8 gives 3.
Observe that 7 - 4 = 3 and 7 - 3 = 4 i.e. 4 removed from 7 gives 3 and
this 3 removed from the same 7 gives 4.
If you remove a number from a given number,
you get the R.H.S. number.
If you remove the R.H.S. number
from the given number,
you will get the removed number.
To find the removed number
which is blank, remove the R.H.S.
number from the given number.
To summarise the above discussion,
We know minuend - subtrahend = result.
If subtrahend is blank, then
subtrahend = minuend - result
Example 3 :
Now I ask you how much subtracted
from 7 wiil give 3.
In other words,
fill in the blank 7 - --- = 3.
From the above observations,
we can say the blank number
= 7 - 3, which you can find by
opening 7 fingers and closing
3 fingers, and counting the
remaining open fingers which is 4.
So the answer is 4.
Let us see one more example.
Example 4 :
Fill in the blank 9 - --- = 2
From the above observations,
we can say the blank number
= 9 - 2, which you can find by
opening 9 fingers and closing
2 fingers and counting the
remaining open fingers which is 7.
So the answer is 7.
Before going for
Example 5 :
Observe that 4 - 1 = 3
and 4 = 3 + 1 i.e. 1 removed
from 4 gives 3 and
this 3 added to 1 gives 4.
Observe that 8 - 3 = 5
and 8 = 5 + 3 i.e. 3 removed
from 8 gives 5 and
this 5 added to 3 gives 8.
Observe that 7 - 4 = 3
and 7 = 3 + 4 i.e. 4 removed
from 7 gives 3 and
this 3 added to 4 gives 7.
If you remove a number
from a given number,
you get the R.H.S. number.
If you add the R.H.S. number
and the removed number,
you will get the given number.
To find the given number
which is blank, add the R.H.S.
number and the removed number.
To summarise the above discussion,
We know minuend - subtrahend = result.
If minuend is blank, then
minuend = subtrahend + result
Example 5 :
Fill in the blank --- - 4 = 2
From the above observations,
we can say the blank number
= 2 + 4, which you can find by
addition
of 2 and 4 which is 6.
So the answer is 6.
Example 6 :
Fill in the blank --- - 3 = 6
From the above observations,
we can say the blank number
= 6 + 3 which you can find by
addition
of 6 and 3 which is 9.
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This Collection of Fun Math Games
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For more information or to have
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