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Example 1.33 from Prealgebra, 1.3 Subtract Whole Numbers
Subtract Whole Numbers: example 1.33
Subtract and then check by adding:
Work it out on paper first. Then open the solution one step at a time, and stop as soon as you can finish on your own.
Solution
Write the numbers so each place value lines up vertically. Subtract the ones.
Write the 3 in the ones place in the difference. Write the 3 in the ones place in the difference.Subtract the tens. We cannot subtract 6 from 0 so we borrow 1 hundred and add 10 tens to the 0 tens we had. This makes a total of 10 tens. We write 10 above the tens place and cross out the 0. Then we cross out the 2 in the hundreds place and write 1 above it. Now we subtract the tens. We write the 4 in the tens place in the difference. Finally, subtract the hundreds. There is no digit in the hundreds place in the bottom number so we can imagine a 0 in that place. Since we write 1 in the hundreds place in the difference. Check by adding.
Our answer is correct.
Your turn
The book's Try It right after this example: same idea, new numbers. Only the answer is given.
Subtract and then check by adding:
How did it go?