Operations & Algebraic Thinking
Two-Step Word Problems Within 100
Combining two operations to solve a word problem.
Prerequisites
- One-Step Word Problems Within 100
Problems with Two Moves
Some stories need more than one operation to solve. A two-step word problem has two separate actions happening — maybe something joins the group, and then something else leaves it — and each step has to be handled in order.
The key to a two-step problem is solving it one action at a time. Work out the first step completely, get a result, and then use that result as the starting point for the second step.
Worked Example — Combining Two Additions
Worked Example — Subtracting Twice
Tip
Common Mistakes
Solving only the first step of the problem and stopping there, missing that a second action still needs to happen.
Reread the question after finishing the first step to check whether the story described a second action that still needs solving.
Using the original starting number for the second step instead of the result from the first step.
The second step always starts from the answer to the first step, not from the numbers given at the very beginning of the story.
Key Takeaways
- A two-step word problem has two separate actions that must be solved in order.
- The result of the first step becomes the starting point of the second step.
- Rereading the question after the first step confirms whether more work is needed.
Summary
Two-step word problems chain two operations together, solved one at a time. Being fast and accurate with smaller sums and differences makes every one of these steps easier — which is exactly the next lesson's focus.
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