It's time to look back over how we can use a vertical algorithm to solve addition and subtraction problems. Remember to:
line digits up by place value columns
start adding, or subtracting, from the units place, then move left
estimate your answer first to get an idea of what to expect
We also looked at how to use a vertical algorithm with trading, or regrouping. For addition, we regroup to the higher place value, but for subtraction, we regroup down to the next lower place value.
Find the value of 34\,246+3213.
Find the value of 49\,481 + 49\,100.
Find the value of 55\,872-2619.
A vertical algorithm is very useful when we starting working with more digits. Even though our numbers may be bigger, the problems are solved the same way, just with more steps. For addition, we need to regroup, or trade to the higher place value, but for subtraction we regroup down to the next lower place.
selects and applies appropriate strategies for addition and subtraction with counting numbers of any size
selects and applies appropriate strategies for multiplication and division, and applies the order of operations to calculations involving more than one operation