Subtraction: Comparison Place Value Table using Decomposition and Subtraction from the Base
Step 0
534
- 345
Set up the chart. Notice the chart is a comparison chart.
Step 1
2 10
534
- 345
9
Notice the first thing to do is decompose a one-ten into ten-ones. Compare the ones
in the subtrahend with the o nes in the minuend that had been renamed from the tens
place (10 - 5 = 5). Then add the five and four to have nine left( 5 + 4 = 9).
Step 2
4 10
2 10
534
- 345
89
Decompose one-hundred as ten-tens because not enough tens in the minuend for the
subtrahend. Compare the tens in the subtrahend with the tens in the minuend from the
decomposition, then add the remaining tens in the minuend. 10 - 4 = 6
6 + 3 = 9.
Step 3
4 10
2 10
534
- 345
189
Subtract three hundreds from the remaining four hundreds. The
result is the final answer.
Notice the last place value chart.