Kiểm tra I tiết Số học 6

TÊN:

ĐỀ 1

Câu 1 : Số nào trong các số sau đây chia hết cho 5 mà không chia hết cho 2 ?

A) 222	B) 2015	C) 118	D) 990

Câu 2 : Tập hợp tất cả các ước của 15 là:

A) 	B) 	C) 	 	D) 

Câu 3 : Số có tổng các chữ số chia hết cho 9 thì chia hết cho:

A) 36	 	B) 27 	C) 18	 	D) 9

Câu 4 : Số có chữ số tận cùng bằng 0; 2; 4; 6; 8 thì chia hết cho:

Câu

Đúng

Sai

a) Nếu một số chia hết cho 9 thì số đó chia hết cho 3

b) Nếu một tổng chia hết cho một số thì mỗi số hạng của tổng chia hết cho số đó.

c) Nếu a x , b x thì x là ƯCLN (a,b)

d) Nếu hai số tự nhiên a và b có ƯCLN (a,b) = 1 thì a và b nguyên tố cùng nhau

II. TỰ LUẬN : (7 điểm)

Bài 1: Phân tích các số sau ra thừa số nguyên tố : 51; 75; 42; 270

 Bài 2: Hãy điền vào dấu * để số 

	a/ Chia hết cho 9

	b/ Chia hết cho 5 và 3

Bài 3: a) Tìm ƯC ( 36,84 ) bằng cách tìm ƯCLN ( 36,84 ).

 b) Tìm BC ( 60, 180 ) bằng cách tìm BCNN ( 60, 180 )

Bài 3: Số học sinh khối 6 của trường trong khoảng từ 200 đến 400. Khi xếp hàng 12, hàng 15 , hàng 18 đều vua đủ. Tính số học sinh của khối 6.

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TÊN:............................

ĐỀ 2: 

 Bài 1: (1,0 điểm) 

 a) Thế nào là số nguyên tố? Thế nào là hợp số?

 b) Viết các số nguyên tố bé hơn 20

Bài 2: (2 điểm) Không tính tổng và hiệu, xét xem tổng hiệu sau có chia hết cho 9 không?

	a) 234 + 135 ;	b) 581 – 7. 18

Bài 3: (2,0 điểm) Phân tích các số sau ra thừa số nguyên tố: 56 và 288 

Bài 4: (3,0 điểm) Bằng cách phân tích các số ra thừa số nguyên tố, hãy:

	a) Tìm ƯC(30, 18) 	b) Tìm BC (20, 24).

Bài 5: (2,0 điểm) Một giá sách có khoảng 150 đến 200 CUỐN . Nếu xếp thành chồng 10 cuốn , 12 cuốn hay 15 cuốn thì vừa đủ, . Hỏi giá sách có bao nhiêu cuốn?

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