Grade 4 - Progress in Mathematics

Zeros in Subtraction

3-9

More hundreds, tens,

and ones are needed.

Regroup all. Subtract. Check.

9 9

2 10 10 10

3 0 0 0


 1 9 5 7

9 9

2 10 10 10

3 0 0 0


 1 9 5 7

1 0 4 3

1 1 1

1 0 4 3

 1 9 5 7

3 0 0 0

3 thousands 


2 thousands 10 hundreds 0 tens 0 ones

2 thousands 9 hundreds 10 tens 0 ones

2 thousands 9 hundreds 9 tens 10 ones

There are 1043 more marbles than Amy’s guess.

Study these examples.

9

7 10 10

$8.0 0


 2.4 6

$5.5 4

9 9

5 10 10 10

6 0 0 0


 9 9 4

5 0 0 6

9

4 10 10

5 0 0


 4 8 7

1 3

Amy guesses that the number of marbles

in a big glass jar at the fair is 1957. The

jar has 3000 marbles. How many more

marbles are there than Amy’s guess?

First, use rounding to estimate: 3000  1957

3000  2000 
 1000

Then subtract: 3000 1957.

Think

1043 is close to the

estimate of 1000.

To subtract when the minuend has zeros:

• Align the minuend and the subtrahend by place value.


• Regroup as many times as needed before starting to subtract.


• Subtract.

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