Column addition & subtraction
Japanese school year: Elementary 3
What you learn
Students learn how to use column methods to accurately add and subtract larger three- and four-digit numbers. This approach is practical when dealing with large quantities or monetary amounts. A firm foundation in two-digit addition, subtraction, and place-value principles will ensure smooth learning.
Key points
In column math, line up numbers on the right by place value and calculate from ones place up.
Write carried numbers small above the next column so you do not forget to add them.
If a middle digit is 0 when borrowing, borrow from the next non-zero digit to the left.
Choose a set to practice.