Test: 4-Digit Numbers- 2 - Class 3 MCQ

• The smallest four-digit number cannot start with 0. Hence, 0345 is not valid.
• The smallest valid digit is 3, so we start with 3.
• Next, we arrange the remaining digits (0, 4, 5) in ascending order to get the smallest combination.
• Thus, the number formed is 3045, which is the smallest possible four-digit number using the digits 3, 4, 0, and 5 exactly once.

• If two numbers have a different number of digits, then the number with the lesser number of digits is smaller.
• For example: 345 is smaller than 1234 as it has a lesser number of digits.

Arrange all the digits in the descending order to get the largest 4-digit number without repeating the digits.
Hence, 3210 is the greatest 4-digit number.

The predecessor of a number is the number which comes just before it.
So, 9898 is the predecessor of 9899.

• When we round off a number, we get the estimated value.
• For example: 56 is rounded off to 60. 60 is not the actual value; it is an estimated value which we get after rounding off to the nearest tens.

When we round off a number to hundreds, we first check the digit at the tens place. If the digit is more than or equal to 5, then we put 0 at the ones and tens place and add 1 to the digit at the hundreds place.
When we round off 1599 to the nearest hundred, we put 0 at the ones and tens place and add 1 to the digit at hundreds place.
So, Riya’s mother rounded off the amount as Rs.1600 and paid it to the shopkeeper.

When we round off a number to the nearest ten, we check the digit at the ones place.
If the digit is more than 5, then we add 1 to the tens and add 0 to the ones.
So, 59 can be rounded off to 60.

5165 has 5 thousands, 1 hundred, 6 tens and 5 ones.
Hence, the number of ones in 5165 is less than the number of ones in 5167.

When we round off a number to the nearest ten, we first check the digit at the ones place.
If the digit is less than 5, then we put a 0 at the ones place and keep the digit at the tens place unchanged.
So, 52 is rounded off to 50.

The successor of a number is the number which comes just after it.
So, 1366 is the successor of 1365.