Video Transcript
Use partial products to calculate
124 times four.
In this question, the calculation
has been set out for us. We’re multiplying our three-digit
number, 124, by four. And we can see from the red arrow
that we have to multiply the ones part of 124 first. What is four multiplied by
four? 16. Next, we have to calculate two 10s
or 20 multiplied by four. 20 times four is 80. So, we’ve got our ones product and
now our tens product. Finally, we need to find the
hundreds product. The one in 124 is worth 100, so we
need to multiply 100 by four, which is 400.
Now, all we have to do is add
together our three partial products. We’ve got a total of six ones, nine
10s, and four 100s. 124 multiplied by four is 496. We used partial products to
calculate the answer.
