SaiBook.us Decimals

Lesson Example Discussion Quiz: Class Homework

Example

Title: Multiplication of decimals

Grade: 5-a Lesson: S2-L3

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 143.1 \$\times\$ 98.1.

Step 1a

The given numbers are 143.1 and 98.1.

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., \$1431 \times 981 = 1403811\$.

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 143.1, there is one decimal place, and for 98.1, there is one decimal place.

Therefore, the total decimal places are 2. 143.1 × 98.1 = 14038.11.