Addition_and_subtraction_missing_value_problems
Learn how to solve problems like "___ - 237 = 448" where you don't know one of the values in an addition or subtraction equation.
Strategies_for_adding_two_and_three_digit_numbers
Learn strategies for solving addition problems within 1000.
Using_regrouping_to_subtract_within_1000
Learn how to subtract numbers like 363 - 259. These subtraction problems are a harder than the ones we've done before because they require regrouping (also called borrowing).
Adding_with_regrouping_within_1000
Learn how to add numbers like 259 + 363. These addition problems are a harder than the ones we've done before because they require regrouping (also called carrying).
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