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
Similarly the standard form 700 + 20 + 8 = 728.
Illustration 1: Fill in the blank .
A: 400
B. 450
C 459
D, None of these
Answer: A
Solution:
The expanded form of 400 + 50 + 9.
The place value of the digits are
For 400 the place value is 4 x 100 or 4 hundreds so it is placed at the hundreds position
For 50 the place value is 5 x 10 or 5 tens so it is placed at the tens position
For 9 the place value is 9 x 1 or 9 ones so it is placed at the ones position.
Hence in step 1 we get 400
459 is three digit number where 4 is at hundreds place, 5 is at tens place and 9 is at ones.
Hence the correct option is A
Illustration 2: The short form of 600 + 30 + 7 in figures is ____________.
A: 600 + 37
B. 630 + 7
C 637
D. None of these
Answer: C
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