69
- = x 0 1 2 3 4 5 6 7 8 9 ( ) % < > + - = x 0 1 2 3 4 5 6 7 8 9 ( )
% < > + - = x 0 1 2 3 4 5 6 7 8 9 ( ) % < > + - = x 0 1 2 3 4 5 6 7 8 9
( ) % < > + - = x 0 1 2 3 4 5 6 7 8 9 ( ) % < > + - = x 0 1 2 3 4 5 6 7 8
9 ( ) % < > + - = x 0 1 2 3 4 5 6 7 8 9 ( ) % < > + - = x 0 1 2 3 4 5 6 7
8 9 ( ) % < > + - = x 0 1 2 3 4 5 6 7 8 9 ( ) % < > + - = x 0 1 2 3 4 5 6
7 8 9 ( ) % < > + - = x 0 1 2 3 4 5 6 7 8 9 ( ) % < > + - = x 0 1 2 3 4 5
6 7 8 9 ( ) % < > + - = x 0 1 2 3 4 5 6 7 8 9 ( ) % < > + - = x 0 1 2 3
Everyone knows it is easy to multiply by 11. If you want to multiply 4
by 11, you simply repeat the digit for the answer, 44. If you multiply
6 by 11 you get 66. What answer do you get if you multiply 9 by
11? Easy, 99.
Did you know it is just as easy to multiply two-digit numbers
by 11?
MULTIPLYING A TWO-DIGIT NUMBER BY 11
To multiply 14 by 11, you simply add the digits of the number,
1 + 4 = 5, and place the answer in between the digits for the
answer, in this case giving you 154.
Let’s try another: 23 × 11.
2 + 3 = 5
Answer: 253
CChapter 8hapter 8
M MULTIPLICATION ULTIPLICATION
BBY 11Y 11
- = x 0 1 2 3 4 5 6 7 8 9 ( ) % < > + - = x 0 1 2 3 4 5 6 7 8 9 ( )