1选择题
Look at the picture. How many apples are there in total? (There are 3 boxes. Box 1 has 25 apples, Box 2 has 18 apples, and Box 3 has 32 apples.)
答案：B
解析：本题考查万以内的加法。需要将三个数字相加：25 + 18 + 32。易错点是计算过程中进位出错。正确计算：25+18=43，43+32=75。
2选择题
The school library is about 500 ________ from the classroom. We usually walk there.
- A. kilometers
- B. meters
- C. tons
- D. kilograms
答案：B
解析：本题考查长度单位的选择。描述校内距离，500米是合理的。千米（A）太远，吨（C）和千克（D）是重量单位。易错点是混淆长度和重量单位。
3填空题
My brother is 12 years old. I am 4 years old. My brother's age is ________ times mine.
答案：3
解析：本题考查“倍的认识”。用哥哥的年龄除以我的年龄：12 ÷ 4 = 3。易错点是误用加法或减法。
4填空题
The perimeter of a square notebook is 28 cm. The length of one side is ________ cm.
答案：7
解析：本题考查正方形周长公式的逆运算。正方形周长 = 边长 × 4，所以边长 = 周长 ÷ 4 = 28 ÷ 4 = 7 cm。易错点是忘记除以4。
5计算题
Calculate: 356 × 4 =
答案：1424
解析：本题考查多位数乘一位数的进位乘法。计算过程：4×6=24（写4进2），4×5=20，加进位2得22（写2进2），4×3=12，加进位2得14。结果为1424。易错点是忘记加进位。
6计算题
Calculate: 803 - 567 =
答案：236
解析：本题考查万以内的减法（需要连续退位）。计算过程：个位3减7不够，向十位借1，但十位是0，需继续向百位借1。百位8借1后剩7，十位变成10，再借1给个位后剩9，个位变成13。13-7=6，9-6=3，7-5=2。结果为236。易错点是退位时忘记在十位、百位标记退位点，导致计算错误。
7解答题
A piece of string is 1 meter long. It is cut into two pieces. One piece is 3/5 meters long. How long is the other piece in meters?
答案：1 - 3/5 = 2/5 (meters). The other piece is 2/5 meters long.
解析：本题考查分数的初步认识和减法应用。总长度减去已知长度，得到另一段的长度。易错点是单位不统一或分数减法计算错误。
8解答题
Tom's family drove to a city 350 km away. They drove 180 km in the morning and 125 km in the afternoon. How many more kilometers do they need to drive to arrive?
答案：350 - 180 - 125 = 45 (km). They need to drive 45 more kilometers.
解析：本题综合考查万以内减法和解决实际问题。用总路程减去已行驶的路程。易错点是计算过程中退位出错，或者忘记用总路程减去两次行驶的路程。