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They are called "thousands".
In place value, a period is each group of three digits separated by commas in a multidigit number.
a decimal in which a digit or group of digits repeats without end
Because it is relatively easy to divide the number into a group of 1 and 3. Much harder to do that with a 16-digit number!
For the group of 3 digit numbers : Any number from 1-9 can be the 1st digit, any number from 0-9 can be the 2nd digit, the 3rd digit can only be one number that matches the 1st digit. The number of possibilities is thus, 9 x 10 x 1 = 90. For the group of 4 digits : Any number from 1-9 can be the 1st digit, any number from 0-9 can be the second digit, the 3rd digit can only be the one number that matches the 2nd number, and the 4th digit can only be the one number that matches the 1st digit. Number of possibilities is 9 x 10 x 1 x 1 = 90. Giving a total of 180 palindromic numbers between 100 and 10000.
They are called "thousands".
Commas are used to separate large numbers into groups of three digits. Each group is called a period.
In place value, a period is each group of three digits separated by commas in a multidigit number.
Commas are used to separate large numbers into groups of three digits. Each group is called a period.
ThreeThe key to answering this question is knowing what the mathematical term "period" means.Period: a period is each group of digits separated by commas in a multidigit number.Example: 30,149,258 is an 8 digit number so each part of the number separated by a comma is 1 period. {30}{149}{258}I hope this helped.
Postcodes in the UK are composed of two groups of letters and numbers, separated by a space.The first group starts with a one- or two-letter prefix, followed by a one- or two-digit number, or one digit and a letter.The second group is always one digit and two letters.Examples:A9 9AAA9A 9AAA99 9AAAA9 9AAAA9A 9AAAA99 9AAA postcode typically covers a business, a P.O. box or group of boxes, or a portion of a residential street.
a decimal in which a digit or group of digits repeats without end
Because it is relatively easy to divide the number into a group of 1 and 3. Much harder to do that with a 16-digit number!
For the group of 3 digit numbers : Any number from 1-9 can be the 1st digit, any number from 0-9 can be the 2nd digit, the 3rd digit can only be one number that matches the 1st digit. The number of possibilities is thus, 9 x 10 x 1 = 90. For the group of 4 digits : Any number from 1-9 can be the 1st digit, any number from 0-9 can be the second digit, the 3rd digit can only be the one number that matches the 2nd number, and the 4th digit can only be the one number that matches the 1st digit. Number of possibilities is 9 x 10 x 1 x 1 = 90. Giving a total of 180 palindromic numbers between 100 and 10000.
The highest two-digit prime number is 97. Out of that group, the highest (and only) prime number is 71.
They divide the number into thousands, and power of thousands, so that millions, billions, and so on can be identified more easily. Whereas it is not easy to tell the magnitude of 17468256795123654, the number 17,468,256,795,123,654 is simpler. It is approx 17.5 quadrillion (5 triplets after its integer part).
Put in commas to separate it into 3 digit groups (starting from the decimal point working left), and then read each group with a multiplier (based on how many groups to the left of the decimal point the group is): 310736136 = 310,736,136 = three hundred and ten million, seven hundred and thirty six thousand, one hundred and thirty six.