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1 Count back from a three-digit number in ones
2 Subtract a single-digit number from a three-digit number
3 Solve missing number problems for addition and subtraction of ones with three-digit numbers
4 Solve missing number problems for addition with multiples of 10 with three-digit answers
5 Subtract two multiples of 10 beyond 100
6 Solve missing number problems for subtraction with multiples of 10 with three-digit answers
7 Count back in tens from a three-digit number
8 Subtract a multiple of 10 from a three-digit number mentally
9 Solve missing number problems for addition and subtraction of tens with three-digit numbers
10 Add and subtract two multiples of 100 within 1000
11 Solve missing numbers for addition and subtraction with multiples of 100 within 1000
13 Subtract a multiple of 100 from a three-digit number
14 Solve missing number problems for addition and subtraction of hundreds with three-digit numbers
15 Subtract numbers with up to three digits using the column method
16 Check by using the inverse operation with three-digit numbers
17 Solve missing number problems for addition and subtraction with three-digit numbers