Khan Academy Static

Topic E includes lessons 18-21. "Decompose once to subtract measurements including three-digit minuends with zeros in the tens or ones place. Decompose twice to subtract measurements including three-digit minuends with zeros in the tens and ones places. Estimate differences by rounding and apply to solve measurement word problems. Estimate sums and differences of measurements by rounding, and then solve mixed word problems." EngageNY

8667_Worked_example_Subtracting_3_digit_numbers_regrouping_twice_.html

8669_Missing_number_for_addition_and_subtraction_within_1000.html

8668_Worked_example_Subtracting_3_digit_numbers_regrouping_from_0_.html

8664_Subtracting_in_your_head_no_regrouping_.html

8663_Adding_and_subtracting_on_number_line_2.html

8665_Worked_example_Subtracting_3_digit_numbers_regrouping_.html

8666_Subtracting_3_digit_numbers_regrouping_2.html