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小升初英文奥数题系列之二
第一期英文奥数推出之后，家长和同学们都反映非常好，说受益匪浅。因此我们推出系列二。但同时也有些问题，很多家长反映孩子觉得比较难。首先希望家长多多辅导孩子，其实奥数知识同学们是都会的，但是有些英文单词不认识，希望家长帮助孩子共同提高。另外，我们只是希望那些比较优秀的同学和学有余力的同学来做，没有必要所有同学都要会做。 1、Did you know? In the decimalnumber system (base 10) ten different digits, 0 to 9, are used to write all thenumbers. In the binary number system (base 2) two different digits are used,i.e. 0 and 1.
Which one of the following numbers is not a valid numberin the
octal number system (base 8)?
A) 128 B) 127 C) 126 D) 125 E)124
2、The number of diagonals thatcan be drawn in a regular polygon with
twenty sides (icosagon) is_____.
3、If a and b are integers, 10Ä3=1,152Ä7=3, and then 379Ä6 is equal to_____.
4、Two numbers are in the ratio 2: 3. When 4 is added to each number the ratio changes to 5 : 7.The sum of thetwo original numbers is____.
5、The greatest number of Mondayswhich can occur in 45 consecutive
days is____
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