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.
291 - 100 =
191
529 + 100 =
629
34+30
64
53-20
33
Dan Dan counted 49 large rocks and 16 small rocks. How many rocks did Dan Dan count?
65
458 - 100 =
358
210 + 100 =
310
56+20
76
87-70
17
Emily's team scored 55 points. Emily scored 36 of the points. How many points did the other players score?
19
500 - 200 =
300
399
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
728 - 400
328
471 + 400 =
871
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
849 - 200 =
649
9 + 500 =
509