Word problems are hard because the story doesn't name the operation. Key words like "total" or "left" can mislead you. Instead, ask what is happening.
| In the story | Operation |
|---|---|
| Putting amounts together | Add |
| Taking away or finding a difference | Subtract |
| Equal groups, several times | Multiply |
| Sharing equally or making groups | Divide |
Before calculating, say what your answer should be about. "I'm looking for dollars left." Then check that it's reasonable.
Work through it
A pack has 12 markers and costs $9. How much do 7 packs cost?
Find what matters. The 12 is extra information here.cost per pack, number of packs
Equal groups mean multiply.
Answer in context.$63
Lia saves $15 a week. She has $40 and wants a $130 bike. How many weeks does she need?
First find how much is missing.
Then how many fifteens fit in 90.
Check: .6 weeks
Watch out for this
Seeing "how many more" and adding.
"How many more does Ana have than Ben" compares two amounts, so you subtract.
The short version
Picture the story. Joining or comparing means add or subtract. Equal groups mean multiply. Sharing equally means divide.
Picture the story. Joining or comparing means add or subtract. Equal groups mean multiply. Sharing equally means divide.
Your turn
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