EM3SRB_G3_74A-74J_CA.qxd
9/19/08
11:56 AM
Page 110
Operations and Computation
U.S. Traditional Subtraction
You can use U.S. traditional subtraction to subtract.
752 254 ?
Step 1: Start with the 1s.
Since 4 2, you need to regroup.
Trade 1 ten for 10 ones:
752 7 hundreds 4 tens 12 ones.
Subtract the 1s: 12 4 8.
4
12
7
2
5
5
2
4
8
6
14
4
12
5
5
9
2
4
8
6
14
4
12
7
2
4
5
5
9
2
4
8
7
2
Step 2: Go to the 10s.
Since 5 4, you need to regroup.
Trade 1 hundred for 10 tens:
752 6 hundreds 14 tens 12 ones.
Subrtract the 10s: 14 5 9.
Step 3: Go to the 100s. You don’t need to regroup.
Subtract the 100s: 6 2 4.
752 254 498
Subtract.
1. 825 786 ?
2.
207
158
Check your answers on page 343A.
74B
3.
2,641
1,939