Multiplicand and Multiplier

We will learn about the multiplicand and multiplier. The number to be multiplied is called the multiplicand. The number with which we multiply is called the multiplier.

1. Multiply 789 by 8

  789        → Multiplicand

×    8       → Multiplier

6312        → Product


2. Multiply 931 by 7

  931        → Multiplicand

×    7       → Multiplier

6517        → Product

The result obtained is called the product.

Multiplication by three-digit numbers:

We know how to multiply the numbers by one and two-digit numbers. Now we will learn to multiply the numbers by three-digit numbers.

Multiplication by a three-digit number is done exactly in the same way as we do by two-digit numbers.


Let us consider some examples:

1. Multiply 546 by 748

      546      

 ×   748      

    4368       → (546 × 8)

  21840       → (546 × 40)

382200       → (546 × 700)

408408

So, the product is 408408

 

2. Multiply 412 by 205

      412      

 ×   205      

    2060       → (412 × 5)

    0000       → (412 × 0)

  82400       → (412 × 200)

  84460

So, the product is 84460


3. Multiply 4392 by 213

      4392      

 ×     213      

    13176       → (4392 × 3)

    43920       → (4392 × 10)

  878400       → (4392 × 200)

  935496

So, the product is 935496.


4. Multiply 3729 by 318

      3729      

 ×     318      

    29832       → (3729 × 8)

    37290       → (3729 × 10)

1118700        → (3729 × 300)

1185822

So, the product is 1185822

Properties of multiplication:

We are familiar with the properties of multiplication. Let us recall the properties.

Commutative property of multiplication

If we change the order of the numbers, the product does not change.

For example:   

7 × 8 = 56     or     8 × 7 = 56

Therefore, 7 × 8 = 8 × 7


Associative property of multiplication

The product of three or more numbers does not change if we change the grouping of the numbers.

For example:      

(6 × 7) × 5 = 42 × 5 = 210

or, (7 × 5) × 6 = 35 × 6 = 210

or, (6 × 5) × 7 = 30 × 7 = 210


One property of multiplication

The product of a number and 1 is the number itself.

For example:   

15 × 1 = 15,     

25 × 1 = 25,      

98 × 1 = 98,        

321 × 1 = 321


Zero property of multiplication

The product of any number and zero is zero.

For example:     

35 × 0 = 0,      

0 × 215 = 0,

240 × 0 = 0,     

960 × 0 = 960


Distributive property of multiplication

The product of a number and the sum of two numbers is always the same as the sum of the product of the numbers.

For example:     

6 × (7 + 5) = 6 × 12 = 72

6 × 7 + 6 × 5 = 42 + 30 = 72

So, 6 × (7 + 5) = 6 × 7 + 6 × 5 = 72

Similarly, the product of a number and the difference of two numbers is always the same as the difference of the product of the numbers.

For example:    

6 × (7 - 5) = 6 × 2 = 12

6 × 7 - 6 × 5 = 42 - 30 = 12


To multiply a number

 

 

 

By 10, 20, 30, 40, 

......... →

multiply the number by 1, 2, 3, 4, ......... and insert one zero on the right of the product.

By 100, 200, 300, 400, 

......... →

multiply the number by 1, 2, 3, 4,........and insert two zeroes on the right of the product.

By 1000, 2000, 3000, 4000,

......... →

multiply the number by 1, 2, 3, 4, ......... and insert three zeroes on the right of the product.




4th Grade Math Activities

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