Question

To play a video game for 30 minutes, Kim buys a ticket for 20 cents. If she plays a game for 5 hours, how many dollars does she need?

Answer 1

Let us find the amount of money required using associative property.
Let us recall this property:
Associative property states that the product of three or more numbers remains the same regardless of how the numbers are grouped.

To play a game for 30 minutes,
$\bullet$ Cost of the ticket =20 cents
$\bullet$ 1 hour = 60 minutes
$\bullet$ Tickets needed for 1 hour $=60÷30=2$ tickets
Total cost for 5 hours $=\text{Tickets needed for 1 hour}\times \text{Number of hours}\times \text{Cost of ticket}$
$=(2\times 5)\times 20$
$\bullet$ Let us use the associative property of multiplication.
$=10\times 20$
$=200\text{cents}$
$\bullet$ Kim has to pay 200 cents to play the game for 5 hours.

Let’s convert cents into dollars.
$\bullet$ $\$1=100\text{cents}$
Number of dollars $=200÷100$
$=\$2$

Hence, B is the correct answer.