How do I do the subtraction problem 10,000 - 443.976? I'm trying to go over homework with my daughter...
I need to know how to do the math problem 10,000 - 443.976
10000.000
- 443.976
-----------------
When the upper digit is smaller than the lower digit,
you need to "borrow" 1 from the next digit to the left.
In this problem, that means going all the way to the
left, where the 1 is. Borrowing 1 from the 10000 gives
you a 10 in the hundreds position, which I have shown
as bold.
9
1
10000.000
- 443.976
-----------------
Borrow 1 from that postion, leaving a 9. Now you have
10 in the tens position, again shown as bold.
99
1
10000.000
- 443.976
-----------------
Borrow 1 from the tens position, leaving a 9 there. You now have
10 in the ones position, the one shown bold.
999
1
10000.000
- 443.976
-----------------
Borrow 1 from the ones position, leaving 9. This time
you have 10 in the tenths decimal position.
9999
1
10000.000
- 443.976
-----------------
We continue, step by step. Borrow 1 from the tenths
position, leaving a 9. This gives you 10 in the hundredths
decimal position.
9999 9
1
10000.000
- 443.976
-----------------
One last borrow. This time, from the hundredths position,
leaving another 9, and giving you 10 in the thousandths
decimal position.
9999 99
1
10000.000
- 443.976
-----------------
You have "borrowed" a ten so you can subtract 6 from it.
9999 99
1
10000.000
- 443.976
-----------------
4
From there, you move to the left, digit by digit,
subtracting each one from the 9 that was left behind.
9999 99
1
10000.000
- 443.976
-----------------
9556.024
Just don't forget that decimal point.