CALCULATING • MORE LONG MULTIPLICATION 123
Next, multiply 7 thousands by 3 ones.
The answer is 21 thousands. Write 1
in the thousands column and 2 in the ten
thousands column.
7242 × 23 = 166 566
ThTThHTh H T O
7242
23
21726
×
Multiply
7 thousands
by 3 ones
Now we’re going to multiply all the
digits on the top row by 2 tens and
write the answers on a new line. When
we multiply by the 2 tens, we’re actually
multiplying by 20, which is 10 times 2.
So, first we put a 0 in the ones column
on the new line as a place holder.
Next, we multiply each of the digits in
the top row by the 2 tens, in the same
way that we did when we multiplied the
top row by 3. The answer on the bottom
line is 144 840.
ThTThHTh H T O
7242
23
21726
×
This 2 means
2 tens, or 20
Put a 0 on a
new line in the
ones column
Now we have multiplied all the digits
on the top row by all the digits on the
bottom row, we use column addition to
add the two lines in our answer together:
21 726 + 144 840 = 166 566
ThTThHTh H T O
7242
×^23
Multiply each
digit on the
top row by
21726 2 tens
144840
So, 7242 × 23 = 166 566
0
1
1
1
ThTThHTh H T O
7242
×^23
Add the
two answers
together
21726
144840
166566
1
1
122-123_More_long_multiplication.indd 123 29/02/2016 14:11