Question

The heart beats 72 times per minute.
The number of times the heart beats in 4 minutes = ?

• A. 280
• B. 288
• C. 292
• D. 290

Answer 1

The correct option is B 288

The heart beats 72 times per minute.

$\text{So, the heart will beat}=72\times 4\text{in 4 minutes.}$

Solving by box method:
$72\times 4\text{can be written as:}$


Step 1: Draw a table as:


Step 2: Fill the table by multiplying the numbers:


Step 3: Add all the products:


So, the heart beats 288 times in 4 minutes.