Number bonds
Recall number bonds (addition and related subtraction facts) within 20
Teaching approaches
Gakuva’s recommended starting approach is selected. You can still compare every option.
1 approach
A number bond is a pair that makes a total. If 8+5=13, then 13-5=8. We use the addition fact to unlock the related subtraction fact.
Spend about 10–15 minutes building bonds and flipping them into subtraction.
Keep a record of your learning
Save photos, notes, and attendance. Export a proof packet for compliance or portfolio reviews.
Learning resources
Reviewed external links that reinforce this concept. They do not replace Gakuva’s teaching approach.
Hit the Button · Number Bonds
Timed recall of addition and related subtraction partners. Choose Number Bonds and set the total within 20 for this concept.
Proof: Save a screenshot showing Number Bonds within 20 and a parent note listing two addition facts and their related subtraction facts the learner recalled.
Addition & Subtraction Facts
Animated number-line model for addition and subtraction facts through 20. Move penguins to see how parts recombine while the equation updates.
Proof: Save a screenshot of a fact within 20 plus a parent note that the learner read the equation and stated the related subtraction fact.
Explore the learning path
2 before · 2 after
This concept
Check understanding
- Quickly recall that 8 + 5 = 13
- Given 13 – 5, respond 8 using knowledge of related addition fact
- Know all pairs of single-digit numbers that sum to numbers up to 20
“Can your child quickly recall facts like '8 + 7 = 15' and immediately know that '15 − 7 = 8' — without having to work out the subtraction from scratch?”
Curriculum record
- Type
- Procedural
- Subject
- Mathematics
- Domain
- Addition & Subtraction
- Age range
- Ages 5–6
Standards