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What is noticeable about the sum in the multiples of 9?
That the sum of its digits add up to 9 as for example 9*9 = 81 and 8+1 = 9
What are the sum of the first multiples of 9?
9 18 = 9 27 =9 36 = 9 etc
What is a number that is between 30 and 56 that is a multiple of 5 and the sum of its digits is 9?
the only multiples of 5 are 30.35.40.45.50, and 55 the only sum to 9 is 45
How many members are there between 1 to 100 which are divisible by 9 and the sum of two digits is 9?
10. They are the first ten multiples of 9.
One half of the sum of three consecutive multiples of 10 is 90 What are the multiples of 10?
If half of the sum is 90 then the full sum must be 180. The three consecutive multiples of 10 which add up to 180 are 50, 60 and 70.
What is noticeable about the sum in the multiples of 9?
That the sum of its digits add up to 9 as for example 9*9 = 81 and 8+1 = 9
What are the sum of the first multiples of 9?
9 18 = 9 27 =9 36 = 9 etc
Can you think of another number pattern in multiples of 9?
The digital sum of multiples of 9 always add up to 9 as for example 9*9 = 81 and 8+1 = 9
What is a number pattern in multiples of 9?
The sum of the digits is also a multiple of 9. And, if the sum of the digits is too large, you can sum those digits and keep going.
What is the rule for multiples of 9?
The total sum of the digits has to equal nine.
Investigate the multiples of nine?
All multiples of 9 have a final digital sum of 9 as for example 9 times 55 = 495 and 4+9+5 = 18 and 1+8 = 9
What numbers have 9 as a factor?
9, 18, 27, ... All numbers whose digital sum is 9. A digital sum is the sum of all the digits of a number. If the sum happens to be greater than 9 then repeat the process of obtaining a digital sum until the result is 9 or smaller.
What is the sum of the first 6 multiples of 9?
The first 6 multiples of 9 are 9, 18, 27, 36, 45 and 54. Their sum (total) is 189. In other words, 1x9 + 2x9 + 3x9 + 4x9 + 5x9 + 6x9 = 21x9 = 189.
What is a number that is between 30 and 56 that is a multiple of 5 and the sum of its digits is 9?
the only multiples of 5 are 30.35.40.45.50, and 55 the only sum to 9 is 45
What are all the numbers that are multiples of 9?
Any number whose digital sum adds up to 9 is also a multiple of 9.
What number is a multiple of 6 and 12 and has the sum of 9 numbers?
All multiples of 12 are also multiples of 6 and they all can be written as the sum of nine numbers.
How many members are there between 1 to 100 which are divisible by 9 and the sum of two digits is 9?
10. They are the first ten multiples of 9.
