Video Transcript
Find the result of the following:
29 multiplied by three equals what.
In this question, we have to
multiply a two-digit number, the number 29, by a single digit, three. And we can tell by the way the
question’s been set out that we have to use the standard written method. We know that two-digit numbers have
a tens digit and a ones digit. The number 29 has two 10s and nine
ones. When we multiply using the standard
written method, we always start by multiplying the ones first. So our first step is to multiply
nine by three. Nine times three is 27. We can write our seven ones in the
ones column and the two 10s in the tens column because 27 has two 10s and seven
ones. Because we’ve regrouped two 10s, we
need to remember to add those on when we’ve multiplied in the tens column.
So our next step is to multiply the
tens. Number 23 has two 10s, and we need
to multiply them by three. Two 10s multiplied by three gives
us a total of six 10s. And we need to add on the two 10s
that we regrouped earlier. Six 10s and two more 10s gives us a
total of eight 10s. 29 multiplied by three equals
87. When we multiply a two-digit number
by a one-digit number using the standard written method, first we multiply their
ones and regroup if we need to, and then we multiply the tens. We found the result of 29
multiplied by three using the standard written method. The result is 87.
