SaiBook.us Decimals

Lesson Example Discussion Quiz: Class Homework

Example

Title: Multiplication of Decimals

Grade: 5-a Lesson: S2-L5

Explanation: The best way to understand decimals is by looking at some examples. Take turns and read each example for easy understanding.

Examples:

Find the product of 100.121 \$\times\$ 121.111.

Step 1a

The given numbers are 100.121 and 121.111.

Multiply the numbers as whole numbers by removing the decimal point.

$1a$

Explanation: In this step, we arrange the numbers. Now ignore the decimal point and multiply the two numbers following the regular multiplication method i.e., \$100121 \times 121111 = 12,12,57,54,431\$.

Step 1b

After multiplying two numbers, count the total number of decimal places.

The product will have the same number of decimal places.

$1b$

Explanation: In this step, determine the decimal places in each number by counting the digits to the right of the decimal point. For 100.121, there are 3 decimal places, and for 121.111, there are 3 decimal places.

Therefore, the total decimal places are 6. 100.121 × 121.111 =12,125.754431