1选择题
Look at the picture. The ruler is about 15 ______ long.
答案：B
解析：本题考查长度单位的合理使用。图片中常见的学生用尺子长度约为15厘米(cm)。易错点是混淆毫米(mm)、厘米(cm)、米(m)和千米(km)的适用场景。
2选择题
There are 1,256 students in our school. Another school has 987 students. How many students are there in total?
- A. 2,243
- B. 2,244
- C. 2,233
- D. 2,234
答案：A
解析：本题考查万以内加法（二），需注意进位。计算过程：1256 + 987 = 2243。易错点是进位时忘记加1或计算错误。
3选择题
Which fraction (分数) represents one quarter of the circle?
答案：C
解析：本题考查分数的初步认识。one quarter 意为“四分之一”，即1/4。易错点是混淆分数的读法和写法。
4填空题
My brother is 8 years old. I am twice his age. I am ______ years old.
答案：16
解析：本题考查“倍的认识”。twice表示“两倍”，即8 × 2 = 16。易错点是理解“twice”的含义，或计算错误。
5填空题
A box has 24 apples. There are 6 such boxes. The total number of apples is ______.
答案：144
解析：本题考查多位数乘一位数（进位）。计算过程：24 × 6 = 144。易错点是进位时忘记加进位点或计算错误。
6填空题
We have 35 storybooks. The number of science books is 3 times that of storybooks. We have ______ science books.
答案：105
解析：本题考查“倍的认识”与多位数乘一位数的结合。35 × 3 = 105。易错点是计算进位时出错。
7解答题
A rectangular garden is 8 meters long and 5 meters wide. What is its perimeter (周长)?
答案：The perimeter of the rectangle is (8 + 5) × 2 = 13 × 2 = 26 meters.
解析：本题考查长方形周长计算。周长公式为（长+宽）×2。易错点是忘记乘以2，或单位未写。
8解答题
A square playground has a side length of 9 meters. What is its perimeter?
答案：The perimeter of the square is 9 × 4 = 36 meters.
解析：本题考查正方形周长计算。正方形周长公式为边长×4。易错点是误用长方形周长公式或计算错误。