In addition you learn to carry; and, since subtraction is the opposite of addition, you will now use

the idea of borrowing in subtraction.

When, for example, you write

476

4 hundreds + 6 tens + 16 units

- 2 5 9, you must think

- 2 hundreds + 5 tens + 9 units

217

2 hundreds + 1 ten

+ 7 units

You can see you changed the Minuend from

4 hundreds + 7 tens + 6 units

to

4 hundreds + 6 tens + 16 units

You borrowed 1 ten from the tens column and added it to the units column so that you can now

subtract: 16 units - 9 units = 7 units.

Now, you try this one.

937

- 569

19

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