Transcript The four written methods

The four written
methods
Column addition
• To do Colum addition fist you must ad the units together
1+7= 8
Next add the tens
8+9= 17
You cant put a two digit number in on Colum so you have to
carry the one 1 so in the Colum you only put seven.
Now the hundreds there's only one number 3
But we've still got a one left add that together
3+1=
4
81
+97
Column subtraction
• In subtracting we borrow in stead of
carrying
• 2-7 cant be done so we borrow from the
tens Colum witch is 4-3 4 becomes 3 and
2 becomes 12.
• Because the one from the four turns 2 into
12.
42
-37
Column multiplication
to do column multiplicaition first you have to
times the units bottom number by the top
number
Next you have to times the unit by the tens
Then by the hundreds
Then do the same with the other bottom numbers.
•
•
123
x 421
The bus stop method
• To do this method first you put the number
out side the bus stop into the number next
to it
• Then any remainders go next to the last
number and make it bigger you repeat this
• Until you get a final number.
45 divided by 2
Maths I
need
maths!!!!!!!!!!