Transcript “Don’t make me read, make me understand “ www.makemegenius.com– Full of ingredients to make your child a genius. Copyright of www.makemegenius.com, for.

“Don’t make me read, make me understand “
www.makemegenius.com– Full of ingredients to make your child a genius.
Copyright of www.makemegenius.com, for more videos ,visit us.
Dividing by a
Decimal Number
The strange story of:
37.5  1.25
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FIRST…
Come up with a QUICK ESTIMATE…
37.5  1.25 looks like it will be close to
37  1, which would equal just 37.
SO… we will be looking for an answer
around 37 and REJECT an answer of
300-something or 3-something.
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37.5  1.25
125 375
To solve this problem using the “paper and pencil”
procedure we would set it up like THIS.
BUT… the regular division procedure does
not work comfortably with decimal
divisors… what can we do ?
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37.5  1.25
will give the same answer as 375
 12.5
...since we multiplied BOTH Dividend and Divisor by 10.
125 375
…and we can do this multiplication by moving the
decimal point one place to the right !
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and 375  12.5
will give the same answer as 3750
 125
…since we multiplied BOTH Dividend and Divisor by 10 again.
125 3750
…and we can do this multiplication by
moving the decimal point one more place to the right !
and annexing a zero in the ones place.
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and 3750  125
we can solve in the usual way
30
125 3750
-375
0
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Thanks
Submitted by
Anish
DAV Public School
Noida
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presentation(ppt) please send it on
[email protected]
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“Don’t make me read, make me understand “
www.makemegenius.com– Full of ingredients to make your child a genius.
Copyright of www.makemegenius.com, for more videos ,visit us.