When asked to subtract whole numbers, we again must recognize and group together the place values of each number.
Let us try 6457 – 312. This example does not require any regrouping. Working from right to left, we have (7 – 2) ones, so we write a 5.
We have (5 – 1) tens, so we write a 4 to the left of the 5. We have (4 – 3) hundreds, so we write a 1 to the left of the 4.
We have 6 thousands, so we write the 6 on the left. The answer is 6145.
Let us try an example with regrouping, such as 562 – 275. We must think of this as (5 – 2 hundreds), plus (6 – 7 tens), plus (2 – 5).
Regrouping, we get (4 – 2) hundreds, plus (16 – 7) tens, plus (2 – 5). Regrouping again, we get 2 hundreds, plus (15 – 7) tens, plus (12 – 5).
Our answer is 2 hundred, 8 tens, and 7, or 287.
Let us try 6457 – 312. This example does not require any regrouping. Working from right to left, we have (7 – 2) ones, so we write a 5.
We have (5 – 1) tens, so we write a 4 to the left of the 5. We have (4 – 3) hundreds, so we write a 1 to the left of the 4.
We have 6 thousands, so we write the 6 on the left. The answer is 6145.
Let us try an example with regrouping, such as 562 – 275. We must think of this as (5 – 2 hundreds), plus (6 – 7 tens), plus (2 – 5).
Regrouping, we get (4 – 2) hundreds, plus (16 – 7) tens, plus (2 – 5). Regrouping again, we get 2 hundreds, plus (15 – 7) tens, plus (12 – 5).
Our answer is 2 hundred, 8 tens, and 7, or 287.
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