Question

Rita has 5 math registers. She uses 4 pages in each register. Find out how many pages are used in all registers using the number line?

Answer 1

Total number of pages used by Rita
$=\text{Number of registers}\times \text{Number of pages used in each registers}$
$=5\times 4=20$

Let's multiply 5 $\times$ 4 using number line
Start at 0, jump 4 times of 5 units each

You will arrive at 20.

Thus, Rita has used total of 20 pages in 5 registers