mespock
Marxists - Socialists
Things to do over the Holidays.
Here are three different ways to prove it. If you talk fast enough, you will be able to fool your family and friends!
FIRST WAY -- MULTIPLICATION
13 7 times 3 equals 21 and
X 7 7 times 1 equals 7.
21 21 + 7 = 28
+ 7
28 So: 7 X 13 = 28!!
SECOND WAY -- DIVISION
13 7 does not divide into 2, but it does
7)28 divide into 8 one time. Put down
7 the 1 and subtract 7. That leaves 21.
21 7 divides into 21 three times.
21
You multiply to check division.
13
So, if 7)28 then 7 X 13 = 28!!
THIRD WAY -- ADDITION
Multiplication is repeated addition so 7 X 13
is seven thirteens added together.
(22) 13 (21)
(23) 13 (18) Add up the column of 3's and get 21.
(24) 13 (15) then add down the column of 1's
(25) 13 (12) and get 7 more (21 + 7 = 28).
(26) 13 ( 9 )
(27) 13 ( 6 ) So: 7 X 13 = 28!!
(28) +13 ( 3 )
28
Here are three different ways to prove it. If you talk fast enough, you will be able to fool your family and friends!
FIRST WAY -- MULTIPLICATION
13 7 times 3 equals 21 and
X 7 7 times 1 equals 7.
21 21 + 7 = 28
+ 7
28 So: 7 X 13 = 28!!
SECOND WAY -- DIVISION
13 7 does not divide into 2, but it does
7)28 divide into 8 one time. Put down
7 the 1 and subtract 7. That leaves 21.
21 7 divides into 21 three times.
21
You multiply to check division.
13
So, if 7)28 then 7 X 13 = 28!!
THIRD WAY -- ADDITION
Multiplication is repeated addition so 7 X 13
is seven thirteens added together.
(22) 13 (21)
(23) 13 (18) Add up the column of 3's and get 21.
(24) 13 (15) then add down the column of 1's
(25) 13 (12) and get 7 more (21 + 7 = 28).
(26) 13 ( 9 )
(27) 13 ( 6 ) So: 7 X 13 = 28!!
(28) +13 ( 3 )
28