Adding Tens
10+30
40
40-20
20
How much to de we need to add to 25 to reach the next highest decuple?
5
33+7
40
____+59=89
30
34+30
64
53-20
33
Which decuple would we subtract down to in 78 - 11?
70
58+6
64
44+____=87
43
56+20
76
87-70
17
How many do we need to add to 25 to get to the next highest decuple?
73-7
66
____-51=32
83
45+50
95
98-50
48
How much do we need to add to 48 to reach the next highest decuple
2
55+45
100
71-____=33
38
12+80
92
79-40
39
How much do we need to add to 91 to reach the next highest decuple
9
90-11
79
98-_____=56
42