Noah has 343 stamps. His friend Hannah gives him five
more stamps. How many stamps does Noah have
This is an addition problem. Noah has 343 stamps, and Hannah
gives him five more. So, to find out how many stamps
Noah has all together, we need to add 343 and five. The number 343 is a three-digit
number. It has three 100s, four 10s, and
three ones. And we have to add five ones. We just need to add the ones
because the number five has no hundreds and no tens.
What is three ones plus five
ones? We know that three plus five is
eight, so 343 plus five equals 348. There was nothing to add to our
hundreds digit and nothing to add to our tens digit. We just had to add five more ones
to the three ones in our number. We know that five more than three
is eight. The only digit which changed was
the ones digit. 343 plus five equals 348.