Adding and subtracting on number line
imp-addition-and-subtraction--imp-strategies-for-adding-two-and-three-digit-numbers--exercise-for-numberline-addition-and-subtraction
Addition, subtraction, and estimation
Strategies for adding two and three-digit numbers
Sal adds and subtracts numbers like 585 and 368 using a number line. Numbers used in these problems are less than 1000.