ABACUS International Math Challenge
for
3rd and 4th graders
November, 2001
A.273. There are birds sitting on a tree.
All but two are crows, all but two are pigeons, and all but two are blue
jays. How many of each kind of birds are sitting on the tree?
A.274. Wily, the bird, read an interesting
story in the newspaper. In 5 minutes he passed it on to 3 other birds. Every
bird that hears the story passes it on to 3 other birds in 5 minutes. How
many birds will know the story in a half an hour?
A.275. Birds are sitting next to one another
on top of the fence, and are looking around. A half a meter from Pick sits
Sip, and 80 centimeters from Sip sits Chip. How far from Pick could Chip
be sitting?
A.276. A few cats snuck in the stable of
the race horses while the birds had a meeting in there. Three horses were
resting in the stable at that time. There were a total of 24 heads and 64
legs in the stable. How many cats and how many birds were in the stable?
A.277. One day Frances and her dad played
with cards. The game was to use all four cards, 2 and 7 and 8 and 11 (J),
to make 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11 (J), 12 (Q), and 13 (K) by any
possible combinations of adding, removing (subtracting), multiplying and
dividing. How can you make these numbers?
A.278. Chip practiced writing down the
whole numbers. He wrote 0, 1, 2, ... What was the 1000th digit he wrote
down?
A.279. Sip and Chip are racing. Sip flew
20 meter less than a half a kilometer in one and a third minutes. Chip flew
a quoter of a kilometer in five sixths of a minute. Who completes one and
a half kilometers first?
A.280. What are the values of the letters
W, O, R, L, D, if
W+O+R+L+D=243,
O+R=95,
L+D=132,
?
Please, send your solutions to: