Standard Form of Numbers
Standard Form of Numbers
The standard form or short form of a number is given by combining the face value of each digit at the correct place.
A three digit number consists of three digit. For example
The standard form of 200 + 30 + 4 is 234.
The place value of the digits are
For 200 the place value is 2 x 100 or 2 hundreds so 2 is placed at the hundreds position
For 30 the place value is 3 x 10 or 3 tens so 3 is placed at the tens position
For 4 the place value is 4 x 1 or 4 ones so 4 is placed at the ones position.
Hence
234 is three digit number where 2 is at hundreds place, 3 is at tens place and 4 is at ones.
Similarly the standard form 700 + 20 + 8 = 728.
In the case of a 4 digit number
A 4 digit number consists of four digits. For example
The standard form of 4000 + 200 + 50 + 9 is 4259.
The place value of the digits are
For 4000 the place value is 4 x 1000 or 4 thousands so 4 is placed at the thousands position
For 200 the place value is 2 x 100 or 2 hundreds so 2 is placed at the hundreds position
For 50 the place value is 5 x 10 or 5 tens so 5 is placed at the tens position
For 9 the place value is 9 x 1 or 9 ones so 4 is placed at the ones position.
Illustration 1: The short form of 600 + 30 + 7 in figures is ____________.
A: 600 + 37
B. 630 + 7
C 637
D. None of these
Answer: C
Solution:
The standard form of 600 + 30 + 7.
The place value of the digits are
For 400 the place value is 400 or 4 x 100 or 4 hundreds so it is placed at the hundreds position
For 30 the place value is 30 or 3 x 10 or 3 tens so it is placed at the tens position
For 3 the place value is 3 or 3 x 1 or 3 ones so it is placed at the ones position.
Hence
637 is three digit number where 6 is at hundreds place, 3 is at tens place and 7 is at ones.
Hence the correct option is C.
Illustration 2: The short form of 7000 + 900 + 80 + 7 in figures is ____________.
A: 7000 + 987
B. 7900 + 87
C 7987
D. None of these
Answer: C
Students / Parents Reviews [10]
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