MathematicsAddition & SubtractionAges 6–7
Unknown in Addition & Subtraction
Determine the unknown whole number in an addition or subtraction equation relating three whole numbers
Teach this topic
Share and support
Entire curriculum
1590 concepts · 8 subjects
Loading map…
Compare teaching approaches
Teaching approaches
Gakuva’s recommended starting approach is selected. You can still compare every option.
1 approach
Selected Default Gakuva
If your child sees '? + 6 = 14' or '9 − ? = 4' written on paper, can they figure out what number goes in the gap?
Determine the unknown whole number in an addition or subtraction equation relating three whole numbers
Family records and proof options
Keep a record of your learning
Save photos, notes, and attendance. Export a proof packet for compliance or portfolio reviews.
Learning resources
External links for extra practice. They do not replace Gakuva’s teaching approach.
No additional resources are listed for this topic.
The teaching approach appears above.
Check understanding
- Solve 8 + ? = 11 and write 3
- Solve 5 = □ − 3 and write 8
- Solve 6 + 6 = □ and write 12
“If your child sees '? + 6 = 14' or '9 − ? = 4' written on paper, can they figure out what number goes in the gap?”
Curriculum record
- Type
- Procedural
- Subject
- Mathematics
- Domain
- Addition & Subtraction
- Age range
- Ages 6–7
Standards
ccss-math:1.OA.8