Ben has 9 crayons and Mai has 7 crayons. How many crayons are there altogether?, 16, Mum makes 18 biscuits and Nam eats 3 biscuits. How many biscuits are left?, 15, There are 12 cars and 5 more cars come. How many cars are there altogether?, 17, There are 16 birds on the tree and 5 birds fly away. How many birds are left?, 11, Nam has 9 toy cars and Mai has 6 toy cars. How many toy cars are there altogether?, 15

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