CALCULATING • EXPANDED LONG MULTIPLICATION 119
First, multiply 7 ones by 1 ten.
The answer is 7 tens, or 70.
On another new line, write 7 in the
tens column and 0 in the ones column.
So, 37 × 16 = 592
Now we’re going to multiply all the
digits on the top row by 1 ten and
continue to write the answers below.
37 × 16 = 592
Next, multiply 3 tens by 1 ten.
The answer is 30 tens, or 300, because
we are multiplying 30 by 10. On a new line,
write 3 in the hundreds column, 0 in the
tens column, and 0 in the ones column.
Now we have multiplied all the digits
on the top line by all the digits on the
second line, we add all four lines in our
answer together:
42 + 180 + 70 + 300 = 592
We’re going to
multiply each
digit in the top
row by 1 ten
×
42
180
H T O
37
16
37
16
Multiply 7 ones
by 1 ten
H T O
×
42
180
70
37
16
Multiply 3 tens
by 1 ten
H T O
×
42
180
70
300
37
16
42
Add the four
answers together
×
180
300
592
1 When we add
4 tens, 8 tens,
7 tens, and
0 tens, we get
19 tens, so carry
the 1 into the
hundreds column
H T O
70
118_119_Expanded_long_multiplication.indd 119 29/02/2016 14:11