Download Dividing Larger Dividends

Dividing Larger Dividends
0011 0010 1010 1101 0001 0100 1011
Chapter 4
By C. Mayfield
©Oct. 13, 2009
1
2
4
Don’t Forget DMSBR
R
0011 0010 1010 1101 0001 0100 1011
S
D
Dad
Divide
Sister
M
Subtract
B
Mom Multiply
Brother
1
2
Rover
Repeat or
Remainder
4
Bring Down
•Look at the divisor
(number outside)
25
5
97
0011 0010 1010 1101 0001 0100 1011
•Look at the dividend
(number inside)
•Look at each digit in
the dividend until you
find one that the divisor
can go into.
•Put a sticky note
behind the first number
5 so you only see 5. You
must ask yourself if 25
can go into 5. NO, 5 is too small
)
1
2
4
•Move the sticky note
over to the next number.
0011 0010 1010 1101 0001 0100 1011
•Then ask if 25 can go
into 59. yes
•Using multiplication-you
multiply the divisor (25)
by a number to get close
to 59 but not over. (Think
of 25 and 50-they are
compatible numbers.)
25) 5 97
1
25
x2
50
2
4
•Write the number you
multiplied by (2) over
0011 0010 1010 1101 0001 0100 1011
the last number in front
of the sticky note.
•Write the answer (50)
under 59.
2
25) 5 97
50
9
•Subtract 59-50= 9
25
x2
50
1
2
4
•Slide the sticky note
over until you see the
0011 0010 1010 1101 0001 0100 1011
next number: 7. Bring it
down.
2
25) 5 97
50
97
•Now you have 97.
•Find out how many
times 25 will go into
25
97.
x4
•Multiply numbers
100
by 25 until you find
an answer that is
close to 97 but not
Hint: Think of 97 being close to 100 (25 x4=100).
over.
2
1
too big
4
•The number you are
looking for is 3.
•Write the answer to the
25
0011 0010 1010 1101 0001 0100 1011
multiplication problem
25x3=75 under 97.
•Write the 3 over the 7.
•Subtract.
•Check to see if there is
another number to bring 25
x3
down. If not, check the
75
final answer 22. It must
be smaller than the
25
divisor (25). The
x4
remainder is 22.
100
2 3 r 22
) 597
50
97
75
22
1
2
4
√ your work!!!!
0011 0010 1010 1101 0001 0100 1011
• Multiply the divisor by the quotient.
1
1
25
23
75
500
575
Add the remainder.
575
22
597
1
2
4
This is your original
dividend.