ACT数学备考，每日一练（三）

　　ACT考试的第二部分是数学（Mathematics Test），时长为60分钟，共60道题。对于中国考生来说，ACT数学的题目相对简单，并且可以使用计算器。但是，能拿到满分的考生并不多。下面就和小编一起继续做题吧。

　　11. Point X is located at negative 15 on the realnumber line. If point Y is located at negative 11, what is the midpoint of linesegment XY?

　　A. -13

　　B. -4

　　C. -2

　　D. 2

　　E. 13

　　正确答案选A。该线的中点是这两个数的平均值，即（-15+11）/2=-2。

　　12. What is the least common multiple of 25, 16, and40?

　　F. 4

　　G. 32

　　H. 320

　　J. 400

　　K. 16,000

　　正确答案选J。在此题中你要知道“the least commonmultiple”是最小公倍数的意思。

　　13. A 16-piece orchestra wants to choose one of itsmembers to speak at performances. They decide that this member CANNOT be one ofthe 4 soloists in the group. What is the probability that Jonah, who is NOT asoloist, will be chosen as the speaker?

　　A. 0

　　B. 1/16

　　C. 1/12

　　D. 1/4

　　E. 1/3

　　正确答案选C。再此题中已经点出有4名独奏者不能参加被选为speaker，那么Jonah被选为speaker的概率就是1/12。

　　14. While working on a lengthy problem on hiscalculator, Matt had meant to multiply a number by 3, but accidentally dividedthe number 3 instead. Which of the following calculations could he do on hiscalculator to obtain the result he originally wanted?

　　F. Multiply by 3

　　G. Multiply by 9

　　H. Divide by 3

　　J. Divide by 9

　　K. Add the original number

　　正确答案选G。本来要乘以3，而Matt却计算错了，除以了3 ，那么要想得到正确答案，就要在基础上乘以9。

　　15. If a sphere is intersected by two different planesNOT occupying the exact same space, how many sections is it possible to end upwith?

　　A. only 2

　　B. only 2 or 4

　　C. only 3

　　D. only 3 or 4

　　E. only 2, 3, or 4

　　正确答案选择选D。你可以想像切一个橙子，你不可能用两个不同的平面切一个橘子，然后得到两块，所以你可以去掉任何有“2”的选择，这就只剩下了C和D选项。你可以把橙子切半，在切半，就此C也被排除了。　　

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