Mixed operations mean solving problems that use both addition and subtraction. In second grade, we use numbers up to three digits (hundreds, tens, and ones). To make solving easier, we can use a strategy called break apart.
Mixed operations require careful attention to the signs (+ or −). Always read the problem slowly to see if you are adding or subtracting.
The break apart strategy means separating a smaller number into tens and ones (or hundreds, tens, and ones) so the problem is easier to solve step by step.
Breaking apart helps you work with friendlier numbers and reduces mistakes.
Let’s add a 3-digit number and a 2-digit number by breaking apart the smaller number.
Always add the tens first, then the ones. It makes the problem easier to solve.
We can subtract a 2-digit or 3-digit number by breaking it apart into tens and ones.
Subtract in steps: first tens, then ones. This keeps the numbers simple.
Sometimes problems have both addition and subtraction. Solve them one step at a time, breaking apart when needed.
Work left to right. Add first, then subtract, unless the directions tell you something different.