## What is a complement of 9?

9’s complement of a decimal number is the subtraction of it’s each digits from 9. Like 1’s complement, 9’s complement is used to subtract a number using addition. For example, let us compute value of “718 – 123” using 9’s complement and addition. We first find 9’s complement of 718 which is 281.

**What is the 10s complement of?**

10’s complement = 9’s complement + 1 For example, let us take a decimal number 456, 9’s complement of this number will be 999-456 which will be 543. Now 10s complement will be 543+1=544.

**What is the complement of 38?**

The complement of 38° is the angle that when added to 38° forms a right angle (90° ).

### Why do we use complements?

Complements are used in digital circuits, because it is faster to subtract by adding complements than by performing true subtraction. The binary complement of a number is created by reversing all bits and adding 1. The carry from the high-order position is eliminated. The following example subtracts 5 from 8.

**How do you do 9’s complement?**

The 9’s complement of a number is calculated by subtracting each digit of the number by 9. For example, suppose we have a number 1423, and we want to find the 9’s complement of the number. For this, we subtract each digit of the number 1423 by 9. So, the 9’s complement of the number 1423 is 9999-1423= 8576.

**Why do we use 9’s complement?**

The 9’s complement is used to find the subtraction of the decimal numbers. The 9’s complement of a number is calculated by subtracting each digit of the number by 9. For example, suppose we have a number 1423, and we want to find the 9’s complement of the number.

#### What is the complement of 87?

The complement of 87° is the angle that when added to 87° forms a right angle (90° ).

**What is the complement of 50?**

90

The complement of 50° is the angle that when added to 50° forms a right angle (90° ).