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Math Facts O'Brien Answer Key

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Addition
#1 6 + 5 11
#2 6 + 7 13
#3 6 + ? = 12 6
#4 29 + 11 = 40
#5 ? + 19 = 23 4
Subtraction
#1 6 - 5 = 1
#2 10 - 7 = 3
#3 10 - 5 = 5
#4 18 - ? = 6 12
#5 20- ? = 1 19
2 digit addition
#1 20 + 10 = 30
#2 10 + 15 = 25
#3 42 + 12 = 54
#4 17 + 41 = 58
#5 15 + 7 + 5 + 3 + 8 = 38
2 digit subtraction
#1 20 - 11 = 9
#2 38 - 14 = 24
#3 45 - 13 = 32
#4 89 - 46 = 43
#5 412- 301 = 111
sharing and arrays
#1 5 rows of 3 = 15
#2 20 shared among 4 groups = 5
#3 3 rows of 4 = 12
#4 36 shared among 6 groups = 6
#5 6 rows of 3 = 18
Final Question
6 + 7 + 3 + 5 + 4 + 5 30