# Three Digit Numbers

Three digit numbers are from 100 to 999. We know that there are nine one-digit numbers, i.e., 1, 2, 3, 4, 5, 6, 7, 8 and 9. There are 90 two digit numbers i.e., from 10 to 99. One digit numbers are made by the digits 1, 2, 3, 4, 5, 6, 7, 8 and 9. In making two digit numbers, zero (0) is also utilized along with digits 1 to 9. In two digit numbers one digit represents number of ones and the other represent the number of tens.

The digit representing ones is placed at one’s place while the digit representing ten’s is placed at ten’s place. As in 52, 5 is at ten’s place having its value 5 × 10 = 50 and 2 is at one’s place having it’s value 2 × 1 = 2.

Similarly, in 35, 5 is at one’s place having it’s value 5 × 1 = 5 and 3 is at ten’s place having its value 3 × 10 = 30 i.e., 35 = 30 + 5.

In the first ten two digits numbers the digits 0, 1, 2, …. are placed after 1 i.e., 10, 11, 12, 13, 14, 15, 16, 17, 18 and 19. Then comes 2 at ten’s place. All the digits are placed after 2 i.e., 21, 22, 23, 24, 25, 26, 27, 28 and 29.

The following table shows the formation of two digits numbers:

Sophia has 99 beads. She uses 10 beads to make 1 garland. She has made 9 garlands and now she is left with 9 beads.

99 = 9 tens and 9 ones

She gets 1 more beads from her mother. She is now able to make another garland of 10 beads.

The total number of beads now 100.

99 and 1 more make 100

Ninety-nine and one more make one hundred.

After 99, the counting number is 100. This is a three digit number. When one is added to 99, the sum is 100.

In 100, there are 10 tens or 100 ones, i.e., (100 = 10 × 10 = 100 × 1). With the help of ones we get tens and with the help of ones and tens we make the numbers of two digits, i.e., from 10 to 99.

We know that

One ten = ten (10)

Two tens = twenty (20)

Three tens = thirty (30)

Four tens = forty (40)

Five tens = fifty (50)

Six tens = sixty (60)

Seven tens = seventy (70)

Eight tens = eighty (80)

Nine tens = ninety (90)

Ten tens = one hundred (100)

Similarly,

1 × hundred = hundred (100)

2 × hundred = two hundred (200)

3 × hundred = three hundred (300)

4 × hundred = four hundred (400)

5 × hundred = five hundred (500)

6 × hundred = six hundred (600)

7 × hundred = seven hundred (700)

8 × hundred = eight hundred (800)

9 × hundred = nine hundred (900)

10 × hundred = ten hundred (1000)

We see that the three digit numbers like 100, 200, 300, 400, 500, 600, 700, 800 and 900 are represented by the numerals having a digit and two zeros. This numbers are the multiples of two numbers i.e., 100 × 1, 110 × 2, 100 × 3, …….., etc.

But the three digit numbers are formed by placing the one and two digit numbers, i.e., from 1 to 99 after the fundamental digits 1, 2, 3, ….., 9 respectively as 101, 102, 103, 104, 105, 106, 107, 108, 109, 110, ……., 117, 118, 119, ………, 125, 126, 127, …….., 134, 135, 136, ……….., 299, 300, 301, ….…., 400, ….…, 427, ………….etc.

In three digit numbers the digits are placed at one’s, ten’s and hundred’s place. At the extreme right of the number there is one’s place, then to the left of it there is ten’s place and to the left of it there is hundred’s place. The digits have their place value in a given number.

For example, in 235 the place value of 5 is 5, of 3 is 30 and 2 is 200. We write this in words as two hundred thirty five.

Let us form the number 100 with the help of blocks. If we say one small block is 1 then a strip made of 10 small blocks will represent 10. A sheet made of 10 strips will show 100.

Numbers from 101 to 110 H1 T0 O1 101 One hundred one H1 T0 O2 102 One hundred two H1 T0 O3 103 One hundred three H1 T0 O4 104 One hundred four H1 T0 O5 105 One hundred five H1 T0 O6 106 One hundred six H1 T0 O7 107 One hundred seven H1 T0 O8 108 One hundred eight H1 T0 O9 109 One hundred nine H1 T1 O0 110 One hundred ten

Numbers from 110 to 200

Count and write the number and number name. 117 One hundred seventeen 128 One hundred twenty-eight 135 One hundred thirty-five 144 One hundred forty-four 156 One hundred fifty-six 167 One hundred sixty-seven 172 One hundred seventy-two 181 One hundred eighty-one 194 One hundred ninety-four 199 One hundred ninety-nine

Skip Counting in Hundreds

It is easier to count larger numbers by making groups of hundreds. 100 One hundred 200 Two hundred 300 Three hundred 400 Four hundred 500 Five hundred 600 Six hundred 700 Seven hundred 800 Eight hundred 900 Nine hundred

Count and write the number and number names. 910 Nine hundred ten 920 Nine hundred twenty 930 Nine hundred thirty 940 Nine hundred forty 950 Nine hundred fifty 960 Nine hundred sixty 970 Nine hundred seventy 980 Nine hundred eighty 990 Nine hundred ninety 999 Nine hundred ninety-nine

The three digits numbers may easily be explained with the help of mathematical apparatus called ABACUS.

### What is spike abacus?

Spike abacus has many iron spikes on a wooden base. The spikes may have globules having wholes. The spikes are named as ones, tens, hundreds, thousands etc. respectively from extreme right to the left.

The number of globules in the concerned spikes expresses the place value of the digit of the number.

In the given picture of the abacus, there are three spikes. In the first spike expressing ones, there are 2 globules, next to it there are 3 globules and in the third spike from the ones’ spike there are 4 globules.

2 globules of the one’s mark, spike express 2 × 1 = 2, 3 globules of the tens spike express 3 × 10 = 30 while 4 globule of the third spike i.e., hundreds spike express 4 × 100 = 400. Thus, the globules placed at different places represent the number 400 + 30 + 2 = 432.

Thus, with the help of ‘abacus’ we can understand the concept of three digit numbers.

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