4.5 Subtracting Across Zeros

Front

What is subtraction?

Back

Subtraction is the mathematical operation of finding the difference between two numbers. It involves taking one number away from another.

Front

What does it mean to subtract across zeros?

Back

Subtracting across zeros refers to the process of subtracting numbers where one or more zeros are involved in the minuend (the number from which another number is subtracted). This often requires borrowing.

Front

How do you borrow in subtraction?

Back

When you need to subtract a larger digit from a smaller digit, you borrow from the next left digit. This means you decrease the left digit by one and add 10 to the current digit.

Front

Example of borrowing: 502 - 189. What is the first step?

Back

The first step is to look at the ones place. Since 2 is less than 9, you need to borrow from the tens place.

Front

What is the result of 1000 - 642?

Back

358

Front

If Robert has finished 642 laps out of 1000, how many more laps does he need to swim?

Back

358 laps.

Front

What is 640 - 1?

Back

639

Front

What is 861 - 0?

Back

861

Front

What is 1440 - 3?

Back

1437

Front

What is 4145 - 4?

Back

4141