Video Transcript
Mia is calculating 33 subtract
four. She showed 33 using place value
blocks. After she regroups and subtracts
four, how many tens and ones will be left?
In this question, we have to help
Mia calculate 33 subtract four. The number 33 is a two-digit
number. And Mia’s modeled this using place
value blocks. 33 has three 10s, worth 30, and
three ones, which are worth three.
The second part of the question
tells us that Mia has to regroup to subtract four. We know that four is more than
three. There are not enough ones in the
number 33 to subtract four from. So we need to take one of our tens
and exchange it for 10 ones. Now we have two 10s and 13
ones. Now we have enough ones to subtract
our four from. 13 take away four is nine. We’ve got nine ones left. We had three 10s. We exchanged one 10, so we only
have two 10s left. And there’s nothing to subtract
from these two 10s in the tens place. So 33 subtract four is 29. After Mia regroups and subtracts
four, she will have two 10s and nine ones left.
