Show:
adding 10's
adding without regrouping
subtracting 10's
adding with regrouping
place value
100
2 tens + 2 tens
4 tens?
100
11 + 5 -------
16
100
4 tens - 2 tens=
2 tens
100
13 + 8 -------
21
100
4 tens and 4 ones
44
200
30+20
50
200
23+5=
28
200
60-20=
40
200
15 + 7 --------
22
200
8 tens and 2 ones
82
300
6 tens + 2 tens
8 tens
300
31+8=
39
300
9 tens - 3 tens=
6 tens
300
15 + 5 -------
20
300
1 hundred 4 tens 3 ones
143
400
50+30=
80
400
21+4=
25
400
8 tens - 4 tens=
4 tens
400
35 + 6 ------
41
400
6 hundreds 0 tens 5 ones
605
500
6 tens + 4 tens
10 tens
500
63+4=
67
500
90-70=
20
500
76 + 6 -------
82
500
4 hundreds 6 tens 0 ones
460