Find a three-digit number
such that the number is divisible by each digit of the number and all the
digits are prime. You can post your answers as comment.
Wednesday 20 November 2013
Multiplying two-digit numbers by 11
To multiply a two digit
number by 11, write the ones digit of the two-digit number at the ones place of
the answer.
Add the ones and tens digit
to get the middle number of the answer.
Write the tens digit of the
number at the hundreds place of the answer.
Example:
To multiply 43 by 11, write
3 at the ones place of the answer.
Add the ones and tens digit
(4 + 3 = 7), 7 is the middle number of the answer.
The tens digit 4 is in the
hundreds place of the answer.
Thus, 43 x 11 = 473
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