Compare two collections
Ava has 14 cards. Ben has 9. The unknown is how many more Ava has: 14 − 9.
Answer: 5 more cards The question compares two known amounts, so find their difference.
Math Word Problems · Grades 3–5
How to Choose the Right Math Operation
Operation choice becomes clearer when a child describes how the quantities are related. A keyword can help, but the story structure is the stronger clue.
What children need to know first
- Addition can join amounts or find a missing part of a total.
- Subtraction can show what remains, how much more, or a missing change.
- Multiplication and division describe equal groups in different ways.
Step-by-step explanation
- Name what each number measures.
- Say what happens or how the amounts relate.
- Decide what quantity is unknown.
- Choose an operation that represents that relationship.
- Estimate or use the inverse operation to check.
Worked examples
Find the total in equal groups
There are 4 boxes with 6 crayons in each: 4 × 6.
Answer: 24 crayons The groups are equal and their number and size are known.
Common mistakes and how to fix them
- Assuming ‘more’ always means addition. ‘How many more?’ often asks for a comparison difference.
- Adding group sizes when equal groups are repeated. Multiply or skip-count instead.
Parent teaching tips
- Cover the numbers and ask your child to explain the situation in their own words.
- Ask what the answer will represent before calculating.
Independent practice
- Noah had 19 stickers and gave away 6. Which operation and how many remain?
- Five bags hold 3 oranges each. Which operation finds the total?
Practice answers
- 19 − 6 = 13
- 5 × 3 = 15
Explore related skills
Practice this skill
Open the matching Grades 3–5 activity for Word Problems. You can print its worksheet with questions only or an answer key.
Start Word Problems practice · View the grade-level topic page