目前所选题目适合小学高年级学生。

Which number is closest to the square root of 180?

A) 12       B) 13         C) 14        D) 15

解析：square root 平方根 

本题有两种解法，一是180=2^2×3^2×5^2，因此，其平方根等于6乘以5的平方根，5的平方根略小于2.25，乘积略小于13.5，因为为B。

二是180的平方根最接近的数的平方与180最接近，几个选项的平方分别是144，169，196，225，因此是13。B选项。

Kiara downloaded 264 pictures from her cell phone to her computer. These pictures took up 528 megabytes of space on her computer. Each picture took up the same amount of space. How many megabytes do 45 of these pictures take up?

A) 25 MB B) 80 MB C) 90 MB D) 18 MB

解析：megabyte是空间存储单位，兆字节，缩写是MB。本题是简单的计算题。528÷264×45=90。答案为C。

A clothing store had polo shirts on sale at 20% off the regular price. The store then took an additional 10% off the sale price. What is the final price of a polo shirt originally priced at $50?

A) $32    B) $35     C) $36     D) $40

解析：50×（1−20%）×（1−10%）=36。选C

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