test 美国小学二年级奥数试题test
1、546 is one of six three-digit numbers each of which is different and has the digits 4, 5, and 6. Write all six out.
2、In the addition problem at the right, different letters stand for different digits. AH represents a two-digits number and HEE repres...
test
1、546 is one of six three-digit numbers each of which is different and has the digits 4, 5, and 6. Write all six out.
2、In the addition problem at the right, different letters stand for different digits. AH represents a two-digits number and HEE represents a three-digit number. What number does HEE represent?
A H
+ A
H E E
3、(1,1,7) is a triple of counting numbers which has a sum of9. Consider (1,7,1) and (7,1,1) to be the same triple as (1,1,7,). How many different triples of counting numbers have a sum of 9? Include (1,1, 7) as one of your triples.
4、A purse contains 2 pennies, 1 nickels,2 dime, and 1 quarter. Different values can be obtained by using one or two coins in the purse. How many different values can be obtained?
5、When a counting number is multiplied by itself, the result is a perfect square. For example 1, 4, and 9 are perfect squares because 1x1=1, 2x2=4, 3x3=9. How many perfect squares are less than 70?
6、The sum of the ages of three children is 32. The age of the oldest is twice the age of the youngest. The ages of the two older children differ by three years. What is the age of the youngest child? Choose the correct answer below.
A、5
B、7
C、6
D、9
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