Abacus Lesson 20 // Subtraction-Complementary Numbers Respect to 5- HUNDRED'S Column Video Lecture | Abacus Master Class:Become an Expert (English) - Personal Learning

all right here we go with the last one
in the series of simple subtraction
we're doing the hundreds column using
complementary numbers clear this off
let's jump right into it complementary
numbers with respect to the number five
so 125 minus 11 so put the number 125 on
there a 1 a 2 and a 5 125 minus 11 so 11
is written a 1 and a 1 so I take away 1
& 2 Oh can't take away 1 so I use my
complementary numbers the complement of
the number 1 is 4 so I add 4 get that
out of the way so 125 minus 11 is 100 of
1 a 1 and a 4 or 114 that's what the
number is 125 minus 11 is 1/4 to 114
let's do another one 365 365 365 minus
1313 is written a 1 and a 3 so I take
away 1 and I go to take away 3 and oh I
can't so what is the complement to
number 3 it's 2 so that means I add 2
and move that out of the way 365 minus
13 is 350 - 350 - and here we go let's
do another I know we're going through
this fast because you're a genius by now
so put the number 255 on your abacus 5 2
5 5 and we are going to take from that
the number 1
104 well 104 is written one zero and a
four so let's work through it I take
away one here don't do anything with
this column because it's 0 and 2 take
away 4 here
well what's it I can it's already down
so I have to use complementary numbers
so that complement to the number 4 is 1
so I want and move that out of the way
so 255 minus 104 is 1 5 1 151 let's try
the number 297 there's the number 297
and we are going to take from that the
number 133 so 297 minus 133 a 1 a 3 and
3 well that one's easy take away 1 take
away 3 oh I can't take away 3
complimentary numbers so the compliment
to the number 3 is the number 2 so I add
2 and get that out of the way so 297
minus 133 is 164 164 297 minus 133 is
164 let's do one last one 245 to a four
and A five 245 - 211 let's see if we can
do this well 211 there's a 1 here well I
can't take away 1 here so I have to add
the complement and get that out of the
way so 245 - 211 is what's that number
we got a 3 and a 4 34 the answer is 34
alright you got it go print off that
worksheet and fly through these problems
you're becoming an abacus master