Adding Tens
10+30
40
40-20
20
Some children wrote letters. 22 children wrote friendly letters. The other 41 children wrote business letters. How many children wrote letters?
63.
33+11
44
34+30
64
53-20
33
Dan Dan counted 49 large rocks and 16 small rocks. How many rocks did Dan Dan count?
65
58+26
84
45+50
95
98-50
48
Paige went on 72 walks. 43 of her hikes were on trails, and 12 of her walks were on the beach. How many of her walks were not on trails or the beach?
17
55+45
100
12+80
92
79-40
39
Dominic planted 42 trees on Wednesday and 38 Thursday. Someone dug up 16 trees on Friday. How many trees were left ?
64
90-49
41