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1 Count back in ones from a four-digit number
2 Subtract a single-digit number from a four-digit number
3 Count back in tens from a four-digit number
4 Subtract a multiple of 10 from a four-digit number
5 Subtract a multiple of 100 from a four-digit multiple of 100
6 Count back in hundreds from a four-digit number
7 Subtract a multiple of 100 from a four-digit number
8 Add and subtract a multiple of 1000 from a four-digit number
9 Subtract mentally by finding the difference, targeting the ten, hundred or thousand
10 Subtract four-digit numbers using column subtraction
11 Exchange across zero to subtract four-digit numbers using column subtraction
12 Check answers using the inverse operation with four-digit numbers
13 Solve missing number problems for addition and subtraction with four-digit numbers