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Lesson Topics Discussion Quiz: Class Homework

Example1

Title: Multiplication of Decimals

Grade Lesson s2-l5

Explanation: The best way to understand SAT-4 is by looking at some examples. Take turns and read each example for easy understanding.

Examples

Topics → Definition Example1

Find the product 56.3 × 0.5.

Step: 1

The multiplication ignores the decimal points in multiplicand and multiplier.
⇒(563)×(05) = 2815

$1a$

. https://uat-image.saibook.org/edu/math/psat/v4/psat-core/s2/l5/example1/1a.jpg

Explanation:

We solve the multiplication problem as we normally would with whole numbers.

Step: 2

After multiplying, count the total number of decimal places in the decimal numbers involved:
56.3 -→ 1 decimal place 0.5 -→ 1 decimal place
Add these decimal places together and position the decimal point in the product accordingly.
Multiplying 56.3 by 0.5 results in 28.15, which has 2 decimal places.

$2a$

. https://uat-image.saibook.org/edu/math/psat/v4/psat-core/s2/l5/example1/2a.jpg

Explanation:

To find the total decimal places in a multiplication, add the decimal places of the numbers being multiplied. 56.3 has 1 decimal place, and 0.5 has 1 decimal place. So, the result will have 2 decimal places: \$56.3 \times 0.5 = 28.15\$.