In formation of numbers with the given digits we may say that a number is an arranged group of digits. Numbers may be formed with or without the repetition of digits. Let us observe some of the formation of numbers without the repetition of digits.
Some 2digit numbers formed by given digits are shown below:
(i) with digits 2 and 3 the formed numbers are 23, 32
(ii) with digits 4 and 7 we may form the numbers 47, 74
(iii) with digits 5 and 9 we may form the numbers 59, 95
But with the digit 0 and the digit 6, only the number 60 is formed. The number 06 is not a twodigit number.
Accordingly, 3digit numbers are also formed.
Some numbers formed by 3 digits are given below:
(a) The numbers by 2, 3, and 4 are:
234, 243, 324, 342, 423, 432 (6 numbers each of 3 digits)
(b) The numbers by 4, 6 and 9 are:
469, 496, 649, 694, 946, 964 (6 numbers each of 3 digits)
(c) The numbers by 3, 7 and 8 are:
378, 387, 738, 783, 837, 873 (6 numbers each of 3 digits)
(d) The numbers by 0, 1 and 5 are
105, 150, 501, 510 (only 4 numbers of 3 digits)
Some numbers formed by 4 digits are given below:
(a) The numbers formed by 1, 2, 3 and 4 are:
1234, 1243, 1324, 1342, 1423, 1432
2134, 2143, 2314, 2341, 2413, 2431
3124, 3142, 3421, 3412, 3214, 3241
4123, 4132, 4213, 4231, 4312, 4321
(b) Similarly, other 4digit numbers may be formed.
We observe that, when the numbers of digits are increased, more and more
numbers are formed. We are familiar with the formation of numbers with 2
or 3 digits. We should know the procedure of forming the greatest and
smallest numbers having definite digits.
Related Concept
● Numbers Showing on Spike Abacus.
● 1 Digit Number on Spike Abacus.
● 2 Digits Number on Spike Abacus.
● 3 Digits Number on Spike Abacus.
● 4 Digits Number on Spike Abacus.
● 5 Digits Number on Spike Abacus.
● Problems Related to Place Value.
● Example on Comparison of Numbers.
● Successor and Predecessor of a Whole Number.
● Formation of Numbers with the Given Digits.
● Formation of Greatest and Smallest Numbers.
● Examples on the Formation of Greatest and the Smallest Number.
4th Grade Math Activities
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