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Example 1.34 from Prealgebra, 1.3 Subtract Whole Numbers
Subtract Whole Numbers: example 1.34
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. We cannot subtract 6 from 0, so we borrow 1 ten and add 10 ones to the 10 ones we had. This makes 10 ones. We write a 0 above the tens place and cross out the 1. We write the 10 above the ones place and cross out the 0. Now we can subtract the ones. Write the 4 in the ones place of the difference. Subtract the tens. We cannot subtract 8 from 0, so we borrow 1 hundred and add 10 tens to the 0 tens we had, which gives us 10 tens. Write 8 above the hundreds place and cross out the 9. Write 10 above the tens place. Now we can subtract the tens. . Subtract the hundreds place. Write the 3 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?