CALCULATING • EXPANDED COLUMN SUBTRACTION 95
H T
Now we just need to add the
24 that will take the total from
300 to 324. Write the 2 in the tens
column and the 4 in the ones column.
Finally, we need to find the total of
all the numbers that we added on:
2 + 20 + 100 + 24 = 146
So, 324 – 178 = 146
Now, we add hundreds. Adding
100 takes us from 200 up to 300.
Write the 1 in the hundreds column and
the zeros in the tens and ones columns.
Write the new total on the right.
324
1 78
H T O
2
Adding 100 to
200 takes the
total up to 300
20
100
324
1 78
H T O
2 180
Adding 24 to
300 takes the
total up to 324
20200
100300
180
200
300
Answers on page 319
Find the difference
Can you use expanded
column subtraction to find
the difference between
these numbers?
TRY IT OUT
−
−
24324
−
324
1 78
O
180
Find the total of
the numbers
we've added on
200
300
324
2
20
100
24
146
9425 − 5832 =?
817 − 394 =?
283 − 76 =?
We arrived at our answer
by adding ones, tens,
and hundreds in steps,
like shopkeeper’s
addition (page 93).
324 − 178 = 146
094_095_Expanded_column_subtraction.indd 95 29/02/2016 14:10