đề kiểm tra chương 1 số học 6 tiết 39

KIỂM TRA SỐ HỌC 6. 1

I/ Trắc nghiệm : Chọn câu đúng nhất rồi khoanh tròn các chữ cái :
Câu 1) Tập hợp nào là hợp số :
a/ {51; 69} b/ { 53 ; 97 } c/ { 67 ; 83 } d/ {37 ; 47 }
Câu 2) ƯCLN ( 12;18) bằng :
a/ 8 b/ 24 c/ 6 d/ 18.
Câu 3) BCNN (100 ;40 ) bằng :
a/ 200 b/ 100 c/ 40 d/ 80.
Câu 4) Tổng (hiệu ) nào sau đây không chia hết cho 3:
a/ 582 – 153 ; b/ 603 + 340 ; c/ 639 + 123
Câu 5) Thay chữ a bằng chữ số nào thì
là số nguyên tố:
a/ 5 b/ 3 c/ 1 d/ 8
Câu 6) Cho(x - 35) –120 = 0.Số tự nhiên x là :
a/ 120 b/ 155 c/ 85 d/ 35.
II/Tự luận :
Câu 1) : Cho các số : 230 ; 402 ; 305 ; 360 ; 534.
a/ Số nào chia hết cho 2
b/ Số nào chia hết cho 3 mà không chia hết cho 9
c/ Số nào chia hết cho cả 2 và 5
Câu 2) : Thực hiện phép tính rồi phân tích kết quả ra thừa số nguyên tố :
315 – ( 33 . 52 – 24.25 )
Câu 3) : Tìm số tự nhiên x biết : 9x + 22 = 73 : 7
Câu 4 : Một số sách nếu xếp thành từng bó 12 quyển , 15 quyển hoặc 18 quyển đều vừa đủ.Tính số sách đó biết rằng số sách trong khoảng 300 đến 400 quyển.
Câu 5) : Tổng sau có chia hết cho 3 không ?
A = 2 + 22 + 23 + 24 + 25 + 26 + 27 +28.

Bài làm
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