Đề kiểm tra 45 phút học kì I môn Số học Lớp 6

Thứ ngày thỏng 11 năm 2018
Họ và tờn:
.............................................................................
Lớp:..........
KIỂM TRA (45 Phỳt)
 Mụn: Toỏn 6
Điểm 
Lời phờ của giỏo viờn
Đề bài:
I. Trắc nghiệm khách quan: (3đ)
*Khoanh tròn vào chữ cái đứng trước câu trả lời đúng:
Cõu 1: ƯCLN(8,9,11) là:
A. 1
B. 2
C. 3
D. 4
Cõu 2: Dạng phõn tớch ra thừa số nguyờn tố của số 36 là:
A. 4.32
B. 22.9
C. 3.3.4
D. 22.32
Câu 3: *Điền dấu "X" vào ô thích hợp:
Câu
Đúng
 Sai
1. Một số tận cùng bởi chữ số 0 thì chia hết cho 5.
2. Một số không tận cùng bởi chữ số 0 thì không chia hết cho 5.
3. Một số chia hết cho 3 thì số đó chia hết cho 9.
4. Một số chia hết cho 9 thì số đó chia hết cho 3.
*Điền vào chỗ (.....) để được các khẳng định đúng:
Câu 4: Nếu có số tự nhiên a chia hết cho số tự nhiên b thì ta nói a là (1)... ....... của b, còn b là (2)............ của a.
Câu 5: Ước chung lớn nhất của hai hay nhiều số là số (1)............................... trong tập hợp các (2).................................... của các số đó
II. Tự luận: (7đ)
Câu 1: Số nguyên tố là gì? Cho ví dụ.
Câu 2: Hợp số là gì? Cho ví dụ.
Câu 3: Điền chữ số vào dấu * để được số:
a) chia hết cho 3
b) chia hết cho 9
Câu 4: Tìm ƯCLN rồi tìm ước chung của:
a) 12 và 48; b) 36, 80 và 156
Câu 5: Số học sinh khối 6 của trường vào khoảng từ 50 đến 100 em. Số học sinh này khi xếp thành 10 hàng, 12 hàng, 15 hàng đều vừa đủ. Tính số học sinh khối 6
Bài làm
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