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1 Count on in ones from a four-digit number
2 Add a single-digit number to a four-digit number
3 Count on in tens from a four-digit number
4 Add a multiple of 10 to a four-digit number
5 Add two multiples of 100 beyond 1000
6 Count on in hundreds from a four-digit number
7 Add a multiple of 100 to a four-digit number
8 Add four-digit numbers using column addition