Video Transcript
In a relay race, Daniel ran 24
meters and then Noah ran 57 meters. What is the total distance they ran
altogether?
In this question, two children ran
a race. We know that Daniel ran 24 meters,
and then Noah ran 57 meters. We have to find the total distance
they ran altogether. In this question, we’re given two
amounts: 24 meters and 57 meters. We need to put these two amounts
together or the two parts together to find the whole or the total amount.
To find the total, we need to add
together 24 and 57. This is an addition problem. How could we work out 24 and
57? We could start with the largest
number, which is 57, and we could count forward mentally in our heads 24. We could start by adding 20 to
57. We know that 20 is two 10s. If we add two 10s to five 10s, we
get seven 10s. So 20 more than 57 is 77. We’re adding 24, so we need to
count forward another four: 77, 78, 79, 80, 81. We started at 57. We counted forward 20 and four
more. 24 plus 57 equals 81.
We could also use a written method
to find the answer. We would start by adding the
ones. 24 has four ones. 57 has seven ones. Four plus seven is 11. We can write one in the ones place,
and we need to place our 10 in the tens column. Now we can add the tens. Two 10s plus five 10s gives us
seven, and one more is eight. 24 plus 57 equals 81. The total distance that Daniel and
Noah ran altogether is 81 meters.
