Transcript Subtracting Across Zeroes Box Method

Box Method
Subtracting Across Zeroes
by Kay McCullough
Benchmark Goal
Add and subtract whole numbers
N.FL.04.08 Add and subtract whole numbers
fluently.
What do you do when
You need to borrow, but the neighbors are
zeroes?
4,000
-1232
Box Method
Subtraction across Zeroes
500 – 324
49
1
500
-3 2 4
1 76
Box Method
Subtraction across Zeroes
300 – 136
29
1
300
-136
1 6 4
Box Method
Subtraction across Zeroes
700 – 382
69
1
700
-382
3 1 8
Box Method
Subtracting across Zeroes
3006 – 1277
299
1
3006
-1 2 7 7
1, 7 2 9
Box Method
Subtracting across Zeroes
6003 – 2915
599
1
6003
-2915
3, 0 8 8
Box Method
Subtracting across Zeroes
8008 – 4539
7991
8008
-4539
3,4 69
Box Method
Subtraction across Zeroes
308 – 136
21
308
-1 3 6
172
Box Method
Subtraction across Zeroes
5900 – 899
5891
5900
-899
5, 0 0 1
Box Method
Subtraction across Zeroes
805 – 622
7
1
805
-622
18 3