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How many numbers are there from 1 to 400 for which the sum of the digit is equal to 7?
Wiki User
∙ 7y ago
For two-digits numbers there are 8 options (07, 16, 25, ... 70).For three-digits numbers:
* If they start with 1, there are 7 options (106, 115, ... 160)
* If they start with 2, there are 6 options
* If they start with 3, there are 5 options
Just add everything (the number of options) up.
Wiki User
∙ 7y ago
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What two prime numbers equal a 400 digit number?
I'm sure there are more than 2 prime numbers that are 400 digits long.
How many numbers between 100 and 400 have the digit 8?
59
How many five digit numbers ae exit such that their product is 400?
30
How many different numbers between 250 and 400 have '2' as the tens digit?
That would be the numbers in the form "32x" (where "x" can be any digit). In other words, ten numbers.
How many whole numbers between 100 and 400 begins or end with digit 2?
30 of them.
What two prime numbers equal a 400 digit number?
I'm sure there are more than 2 prime numbers that are 400 digits long.
How many numbers between 100 and 400 have the digit 8?
59
How many 3 digit numbers between 99 to 500?
400 of them.
How many five digit numbers ae exit such that their product is 400?
30
How many 5 are in between 200 to 400 numbers?
If you write all of the counting numbers from 200 to 400,you will write the digit ' 5 ' forty times.
How many different numbers between 250 and 400 have '2' as the tens digit?
That would be the numbers in the form "32x" (where "x" can be any digit). In other words, ten numbers.
How many whole numbers are in a set between 100 and 400 that contain the digit 2?
138 of them.
How many whole numbers between 100 and 400 begins or end with digit 2?
30 of them.
How many 3 bet 300to400?
All the numbers between 300 and 400 have a 3 as their first digit - that's 100 Ten of the numbers between 300 and 400 have a 3 as their second digit - that's 110 Ten of the numbers between 300 and 400 have a 3 as their final digit - that's 120
How many whole numbers between 100 and 400 contain the digit 2 in their standard notation?
The answer is 138
Among all 3 digit numbers from 100-400 how many have exactly one that is 8?
57
How many four digit whole numbers are there such that the thousand digit is odd the hundreds digit is even and all four digits are different?
5*5*4*4 = 400
