Subtraction Without Borrowing
Step 1
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Put the subtraction problem into columns lining the place values up with each other. For instance, the ones need to be above and below each other as well as the tens and so on.
So... When doing 346 - 23, you would line it up like the picture to the left.
So... When doing 346 - 23, you would line it up like the picture to the left.
Step 2
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Start in the ones place and subtract the bottom number from the top.
6 - 3 = 3 Put this in the ones place
6 - 3 = 3 Put this in the ones place
Step 3
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Do the same thing that you did for the ones place in the tens place and the hundreds place.
Tens: 4 - 2 = 2
Hundreds: Bring the 3 down since there is
nothing to subtract from it
Tens: 4 - 2 = 2
Hundreds: Bring the 3 down since there is
nothing to subtract from it
Subtraction With Regrouping
**Bigger Bottom Better Borrow**
Step 1
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Put the subtraction problem into columns lining the place values up with each other. For instance, the ones need to be above and below each other as well as the tens and so on.
So... When doing 346 - 57 You would line it up like the picture to the left.
So... When doing 346 - 57 You would line it up like the picture to the left.
Step 2
Since the bottom is bigger in the ones, you need to go to the tens and borrow a ten. When doing this you need to cross out the 4 (4 tens) and replace it with a 3 (3 tens) and bring the 10 that you borrowed and put it in the ones place like the picture to the left shows.
Then solve the problem in the ones place 16 - 7 = 9
Then solve the problem in the ones place 16 - 7 = 9
Step 3
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Now you are going to solve the subtraction problem in the tens place. Since the bottom is bigger, you need to borrow from the hundreds. When doing this you need to cross out the 3 (3 hundreds), replace it with a 2 (2 hundreds), and bring the 100 that you borrowed to the tens place like the picture to the left shows.
Then solve the problem in the tens place 13 - 5 = 8
Then solve the problem in the tens place 13 - 5 = 8
Step 4
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Since there is nothing to subtract from the hundreds place you just bring the 2 down like the picture to the left shows.
The answer to 346 - 57 = 289
The answer to 346 - 57 = 289
Subtracting Across Zeros
You can't subtract 0-7 in the ones column so you need to borrow a group from the tens column. Since the tens column doesn't have anything (0), you need to move to the hundreds column. There is a 3 in the hundreds place but since you need to borrow 1 group of 100 you need to cross it out and replace it with a 2 (2 hundreds). Now you move back to the tens replace the 0 with a 9 (9 tens or 90) and move back to the ones place and bring a group of ten adding a 1 in front of the zero.
So... Now you can solve the problem... Ones: 10 - 7 = 3 Tens: 9 - 5 = 4 Hundreds: There is nothing to subtract from the 2 so just bring the 2 down Final answer... 300 - 57 = 243 |
Rules to remember when subtracting...
-ALWAYS start in the ones place and move to the left.
-If the bottom is bigger you need to borrow.
-When borrowing from the place to the left has a 0, move another spot over until there is something that you can borrow. One the way back you drop off 9's until you get to the spot that needed to borrow.
-If the bottom is bigger you need to borrow.
-When borrowing from the place to the left has a 0, move another spot over until there is something that you can borrow. One the way back you drop off 9's until you get to the spot that needed to borrow.