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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
12 Count back in hundreds
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
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