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Study
Numbers 11-20
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18-2
16
Oops!
Okay!
11+4
15
Oops!
Okay!
11+1
12
Oops!
Okay!
13+7
20
Oops!
Okay!
12+6
18
Oops!
Okay!
3+13
16
Oops!
Okay!
19-2
17
Oops!
Okay!
20-9
11
Oops!
Okay!
10+2
12
Oops!
Okay!
12+2
14
Oops!
Okay!
10+9
19
Oops!
Okay!
10+10
20
Oops!
Okay!
10+6
16
Oops!
Okay!
19-5
14
Oops!
Okay!
10+3
13
Oops!
Okay!
10+7
17
Oops!
Okay!
20-5
15
Oops!
Okay!
16+3
19
Oops!
Okay!
10+1
11
Oops!
Okay!
15+2
17
Oops!
Okay!
20-1
19
Oops!
Okay!
10+5
15
Oops!
Okay!
10+8
18
Oops!
Okay!
7+4
11
Oops!
Okay!
16-3
13
Oops!
Okay!
20-2
18
Oops!
Okay!
19+1
20
Oops!
Okay!
10+4
14
Oops!
Okay!
12+1
13
Oops!
Okay!
15-3
12
Oops!
Okay!
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