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100 mixed addition and subtraction oral calculation problems
( 1)53 + 19 -20

(2)54 + 53 - 13

(3)30 + 56 -45

(4)66 + 36 =

(5)79 + 56 =

(6)93 + 98 =

(7)20 + 48 =

(8)6 1 + 33 =

(9)8 1 + 5 1 =

( 10)96 + 55 =

( 1 1)73 + 34 =

( 12)30 + 72 =

( 13)64 + 7 1 =

( 14)66 + 92 =

( 15)65 + 44 =