Video Transcript
By counting back in 10s and ones on
a number line, find 54 take away 29.
In this question, we need to
subtract two two-digit numbers. We need to find the answer to 54
take away 29. And we’re told how to find the
answer. We need to count back in 10s and
ones on a number line. And we can see part of a number
line below where the answer has started to be worked out. What’s being marked on the number
line already? Well, firstly, we can see the
number 54. This is the number that we’re
beginning with. We need to take away 29 from this
number. So we need to count backwards from
54.
And we’re told that we need to
count back in 10s and ones. Now, if we’re subtracting 29, how
many 10s and how many ones do we need to jump back? We know that 29 is the same as two
10s or 20 and nine ones. And this tells us the number of
jumps we need to make. We need to count back two 10s and
then nine ones. Let’s count back two 10s to begin
with. So, we’re gonna start with the
number 54. And we can see that our first jump
of 10 is marked on the number line already. If we count back 10 from 54, we get
44.
Now, we can see part of the next
jump of 10, but we can’t see it all. So let’s complete this next jump of
10. There, we go. We’ll label it minus 10 to remind
ourselves what we’ve done. And if we count back 10 from 44, we
reach 34. We’ve counted backwards two 10s,
and we’ve gone from 54 to 34. Now, we just need to count back
nine ones. One, two, three. Can you see how we’re labeling the
number line by taking away one each time? 34, 33, 32, 31. Four, five, six, seven, eight,
nine. 34, 33, 32, 31, 30, 29, 28, 27, 26,
25.
To find the answer to 54 take away
29, we started on a number line with 54 and then we subtracted 29 by jumping back
two 10s and nine ones. The number we ended up on was
25. 54 take away 29 equals 25.
