138 is divisible by 3 because if you add each integer: 1 + 3 + 8, you get 12. If 12 number is divisible by 3, than the whole number is. Since it is, 138 is divisible by 3.
:malik received a $300 gift card from his grandparents and is using it only to pay for his karate lessons, which cost $30 per month. determine what amount, in dollars, remains on the card after 8 months.