Properties of Numbers in Grade 10 Math
1. Closure Property
The Closure Property states that the result of an operation on any two numbers of a set is also a number in the same set. For example, in the set of whole numbers, the sum and product of any two whole numbers are always whole numbers.
Example:
If we take two whole numbers, say 3 and 5, their sum is 3 + 5 = 8, which is also a whole number. Similarly, their product is 3 × 5 = 15, which is also a whole number.
2. Associative Property
The Associative Property states that the way in which numbers are grouped in an operation does not change the result. This property applies to both addition and multiplication.
Example:
For addition, (2 + 3) + 4 = 2 + (3 + 4). Here, both sides equal 9.
For multiplication, (2 × 3) × 4 = 2 × (3 × 4). Here, both sides equal 24.
3. Commutative Property
The Commutative Property states that the order in which numbers are added or multiplied does not change the result. This property applies to both addition and multiplication.
Example:
For addition, 2 + 3 = 3 + 2. Both sides equal 5.
For multiplication, 2 × 3 = 3 × 2. Both sides equal 6.
4. Distributive Property
The Distributive Property states that multiplying a number by the sum of two or more addends is the same as multiplying each addend separately and then adding the products. This property is crucial for simplifying expressions.
Example:
For the expression 2 × (3 + 4), we can distribute the 2 to both 3 and 4:
2 × (3 + 4) = 2 × 3 + 2 × 4 = 6 + 8 = 14.
5. Identity Property
The Identity Property states that there exists a unique number for addition (0) and multiplication (1) such that when this number is added to or multiplied by any number, the result is the original number.
Example:
For addition, 5 + 0 = 5.
For multiplication, 5 × 1 = 5.
6. Inverse Property
The Inverse Property states that for every number, there exists another number such that when the two numbers are added or multiplied, the result is the identity element (0 for addition and 1 for multiplication).
Example:
For addition, the inverse of 5 is -5 because 5 + (-5) = 0.
For multiplication, the inverse of 5 is 1/5 because 5 × 1/5 = 1.