ABACUS International Math Challenge
for
3rd and 4th graders
September, 2000
A.193. Write +, -, or x operation signs
between the numbers so that the equality is true: 1 2 3 4 5 6 7 8=9.
A.194. Write the numbers 1, 2, 3, 4, 5,
6, 7, 8, 9 in the fields of the 3x3 square so that the sums of the numbers
in each column and row are as indicated.
A.195. Write the numbers 1, 2, 3, 4, 5,
6, 7, 8, 9 in the fields of the 3x3 square so that the products of the numbers
in each column and row are as indicated.
A.196. Find the greatest positive whole
number in which every digit (starting with the third digit) is the sum of
the previous two digits.
A.197. Write the numbers 3, 4, 5, 6, 7,
8, 9 into the small circles so that the sums of the numbers along each circle
or straight line is the same.
A.198. Four children took guesses on Andrew's
height: 196cm, 163cm, 178cm, and 185cm. One of these children was 1cm off,
the others were 6cm, 16cm and 17cm off. How tall is Andrew?
A.199. Find three digits so that when you
put them in different orders you can create three 3-digit numbers such that
two of them add up to the third 3-digit number.
A.200. Replace the # signs with the digits
0, 1, 2, 3, 4, 5, 6, 7, 8, and 9 (using all of them) so that the addition
is true. (None of the numbers should start with zero.)
Please, send your solutions to: