ABACUS International Math Challenge
for
3rd and 4th graders
April, 2002
The final deadline for you to send in your solutions to
these problems and all of those posted since September, 2001 is
May 31, 2002.
A.313. How many 2-digit positive whole
numbers have at least one even digit?
A.314. Out of the following numbers, find
the least number of them that add up to 100:
5, 17, 19, 37, 39, 46, 66
A.315. There are 8 cups in a row on the
table with no space between them. The first 4 cups are empty, the last 4
cups have water in them. How can you arrange that the empty cups and the
cups with water would alternate in the row by touching only two cups?
A.316. How many 2-digit numbers start with
an odd digit?
A.317. How many 3-digit numbers have exactly
one zero digit?
A.318. How many 3-digit numbers have no
zero digit?
A.319. A 2-digit number is divisible by
7 and 11. How many divisors does it have?
A.320. Find the next element of the following
sequence: 100, 101, 103, 107, 115, 122, ...
Please, send your solutions to: