Question

How many numbers from 1 to 1000 are divisible by 5 or 7?

Answer 1

1. From 1-1000 divisible by 5:

• Greatest number: 995
• Smallest number: 5

From 1-1000 divisible by 5 : (995-5):5+1=199 (numbers)

      2.From 1-1000 divisible by 7

• Greatest number: 994
• Smallest number: 7

.From 1-1000 divisible by 7 : (994-7):7+1=142 (numbers)

chúc bạn học tốt 

Answer 2

1. From 1-1000 divisible by 5:

• Greatest number: 995
• Smallest number: 5

From 1-1000 divisible by 5 : (995-5):5+1=199 (numbers)

      2.From 1-1000 divisible by 7

• Greatest number: 994
• Smallest number: 7

.From 1-1000 divisible by 7 : (994-7):7+1=142 (numbers)

Comments

sorrry

mình chỉ nghĩ tới 100 thôi.

số chia hết cho 5 còn lại là :100.105.110.120.130.140.150.160.170.180.190.200(còn nhiều lắm bn à) 

Nói chung là những số tận cùng bằng 0 hoặc 5 thì chia hết cho 5

Answer 3

1. From 1-1000 divisible by 5:

• Greatest number: 995
• Smallest number: 5

From 1-1000 divisible by 5 : (995-5):5+1=199 (numbers)

      2.From 1-1000 divisible by 7

• Greatest number: 994
• Smallest number: 7

.From 1-1000 divisible by 7 : (994-7):7+1=142 (numbers)

Comments

Numbers divisible by 5 and 7:

Greatest number: 980

Smallest number: 35

Numbers divisible by 5 and 7 from 1-1000: (980-35):35 +1=28 (numbers)

 

Answer 4

1. From 1-1000 divisible by 5:

• Greatest number: 995
• Smallest number: 5

From 1-1000 divisible by 5 : (995-5):5+1=199 (numbers)

      2.From 1-1000 divisible by 7

• Greatest number: 994
• Smallest number: 7

.From 1-1000 divisible by 7 : (994-7):7+1=142 (numbers)

chúc bạn học tốt !!!!!!