The weekly income of a family is
781 pounds. The family spends 242 pounds on
rent, 270 pounds on food, 129 on bills, and the rest is saved. How much does the family save?
We know the family’s weekly income
is 781 pounds. And they spend 242 on rent, 270 on
food, and 129 on bills. And the family saves the rest of
the money. Before we can work out how much
money they save, we need to work out how much money they spend. 242 on rent, 270 on food, and
another 129 is spent on bills. We need to add together the total
amount the family spends each week.
We can add these three numbers
using column addition. Let’s start by adding in the ones
column. We have two, zero, and nine. What is two plus zero plus
nine? 11. We need to exchange the one. In the tens column, we’ve exchanged
one. And we have to add four, seven, and
two. Four plus seven is 11. Two more makes 13 plus the one we
exchanged gives us a total of 14. We can write the four and exchange
the one. Finally, we need to add in the
hundreds column. Two plus two is four. One more makes five plus the one we
exchanged gives us a total of six. So all together, the family spends
641 pounds each week.
To find out how much money the
family has left over for their savings, we need to subtract the amount they spent
from the amount they have, to begin with. Their income is 781. And they spend 641. So we need to subtract 641 from
781. In the ones, we have one. And we need to take away one, which
leaves us with nothing. We have eight tens. And we need to take away four tens,
which leaves us with four. And in the hundreds, we have seven
hundreds. And we need to take away six, which
leaves us with one. 781 take away 641 leaves us with
140 pounds. Each week, the family is able to
save 140 pounds.
To find the answer, first we added
together the total amount that the family spends each week. And we subtracted this from their
income, which leaves the family with 140 pounds each week for saving.