Tens
Tens
Ones
30 +
= 70
30 +
= 60
= 60 - 20
20 +
= 70
20 +
= 60
= 70 - 30
0 +
= 70
= 10 + 50
10 +
=
- 10
20 +
=
- 10
20 +
<
- 10
20 +
>
- 10
40 =
- 40
Ones
60 -
Tens
= 30
Ones
60 -
= 60
90 -
= 60
= 90 - 40
60 -
= 50
70 -
= 60
= 90 - 50
= 80 - 60
= 60 - 50
70 =
- 10
30 -
=
- 10
30 -
<
- 10
30 -
>
-0
40 =
-0
34 + 22 =
Tens
Ones
= 23 + 14
12 +
= 54
44 +
= 77
= 43 + 25
22 +
= 78
16 +
= 39
49 =
37 + 44 =
37 + 47 =
37 + 43 =
37 + 49 =
+ 33
= 80 - 60
= 33 + 43