Share Add and subtract tens
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50-20
30
30+40
70
10+20
30
90-50
40
100-30
70
20+40
60
50+10
60
20+10
30
50-40
10
50+20
70
30-20
10
70+10
80
20+40
60
10+10
20
100-20
80
80-60
20
