Main content
6th grade
Adding three decimals
Sal adds 7.056+605.7+5.67 using the "standard algorithm". Created by Sal Khan and Monterey Institute for Technology and Education.
Want to join the conversation?
what is bigger 5.30 or 5.1000(111 votes)
5.30 is larger because 3/10 is larger than 1/10(15 votes)
How do you add negative decimals(6 votes)
well, if you have say -0.5 + -1.5, you would think of it as a number line. SO our first number is -0.5, so we go -0.5 spaces to the left since left is negative on a number line. Then since you are adding another negative number, you go left 1.5 more spaces from tthe -0.5 you are already at, tto get -2.0, so basically add tthe numbers like they are two positive numbers then put the negative infront.
Comment if you understand.(2 votes)
So i dont get how you do this could you please tell me?(5 votes)
do a sheet of paper
doing something like 15.80 + 8.20
0 + 0 = 0
8 + 2 = 10
carry the 1
5 + 8 + 1 = 14
carry the one
1 + 1 is 2
combine those answers together
you get 24.
just so you know something like 5.20 + 4.60 is 9.80, so we do need the decimal point.(2 votes)
- so if i had to add 7.056 to 6098. what does that maank(3 votes)
As with every addition problem, it becomes much easier if you just line up the places up correctly:
6098.000
+ 7.056
From here, we just add the places in order. From the thousandths place, we get a 6, since 0 + 6 = 6. For the next places:
0 + 5 = 5
0 + 0 = 0
8 + 7 = 15, carry the 1 over to the next place
1 + 9 + 0 = 10, carry the 1 over to the next place
1 + 0 = 1
6 + 0 = 6
From this, we put all the separate problems together for the final answer. This is 6098 + 7.056 = 6105.056
Hope this helped!(3 votes)
- which is the bigger one 3.724 or 3.709(2 votes)
3.724 because the number in the hundredths place is bigger than the one in the other number.(2 votes)
What is bigger
6.12800000 or 6.1270(2 votes)
Go place value by place value. Both start with a 6.12, then thousandths place compares 8 to 7, so first number is bigger.(2 votes)
Is there such thing as negative decimals? If so, can you add, subtract, multiply or divide them?(2 votes)- Yes. All real numbers have opposites including decimals like 1.4534. Its opposite is -1.4534.
And yes, you can add, subtract multiply and divide them.
Below is a decimal subtraction example using money.
If you owe me $3.25 then you have an account balance with me
of -$3.25. if you then borrow another $1.50 you would have a net balance of -$3.25 - $1.50 = - $4.75.(1 vote)
if you add 15.000 + 1500.000000 how much(2 votes)
Well if u don't have to why do it?(2 votes)
You mean, "Well if you do not have to do it, why do you do it?".(1 vote)
- So 1.320000000000 is the same as 1.32(1 vote)
- Yes that's right no matter how many 0's you have Careron it's still the same.(3 votes)
Video transcript
We need to add 7.056
to 605.7 to 5.67. Now when you're adding any
number, you always want to make sure you line up numbers
in the same place. And especially when you're
dealing with decimals, the easiest way to do that is to
just line up the decimals. So let's do that. So the first number right
here is 7.056. This second number right
here is 605.7. And then this last
number is 5.67. So now we have everything
lined up. Everything that's in the ones
place is below or above everything else in
the ones place. Everything in the tenths place
is below or above everything else in the tenths place,
and so on and so forth. So we can add. So let's add it. So you want to start off
in the smallest place. So you start off here. This is the tenths, hundredths,
thousandths place. This is literally 6 thousandths,
and you want to add it to the other
thousandths. There aren't any other
thousandths. So you can view it two ways. You can just bring in this 6
down, or you could view this 605.7 as the same thing
as 605.700. You can add as many zeroes to
the right of this decimal, to the right of the 7, as you want,
since we're sitting on the right side of the decimal,
without changing its value. You can also do it here. This 5.67, you can write
it as 5.670. When you write it like
this, and you have 6 plus 0 plus 0 is 6. And you keep going. 5 plus 0 plus 7 is 12. You write the 2 in the
hundredths place, and carry the 1. 1 plus 0 plus 7 is
8, plus 6 is 14. Write the 4, regroup the
1 into the ones place. 1 plus 7 is 8. 8 plus 5 is 13. 13 plus 5 is 18. This is 18. Carry or regroup the 1. 1 plus 0 is just 1. And then finally. You have the 6 in the
hundreds place. Nothing gets added to it, so you
can just bring down that 6 and it's right there. And you don't want to
forget the decimal. And so when you add the numbers
you get 618.426, or 618 and 426 thousandths. And we're done.