Number bonds
Recall number bonds (addition facts and related subtraction facts): within 10 at the first stage (as in Ontario Grade 1), extending to within 20 (as in England Year 1 and Australian Year 2)
Lesson
Set out your lesson
“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.”
Bring to the table
- 20 counters or blocks
- Paper and marker
Extra for the adult
Worked example. Bond 12 can be 10+2. Related subtraction: 12-2=10. Bond 15 can be 8+7, so 15-7=8.
Optional challenge. For 18, list two different bonds and one related subtraction for each.
What to notice. Save a parent note with one addition bond and its related subtraction fact.
Share and support
Compare teaching approaches
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.
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
Extra practice links — they do not replace Gakuva’s teaching approach.
Topmarks · Practice link — not the full lesson
Hit the Button · Number Bonds
Before you open · source notes
Timed recall of addition and related subtraction partners. Choose Number Bonds and set the total within 20 for this concept.
Free · no login · ads · timed play
Before you openSave a screenshot showing Number Bonds within 20 and a parent note listing two addition facts and their related subtraction facts the learner recalled.
Opening this link does not save learning or assess mastery.
Source, access and review notes
Unknown — link only
Visnos · Practice link — not the full lesson
Addition & Subtraction Facts
Before you open · source notes
Animated number-line model for addition and subtraction facts through 20. Move penguins to see how parts recombine while the equation updates.
Free · no login · no ads observed
Before you openSave a screenshot of a fact within 20 plus a parent note that the learner read the equation and stated the related subtraction fact.
Opening this link does not save learning or assess mastery.
Source, access and review notes
Unknown — link only
Check understanding
- Recall addition facts within 10 and the related subtraction facts (e.g. 7 + 3 = 10, so 10 − 3 = 7)
- Recall addition facts within 20 and use a related addition fact to subtract (e.g. 8 + 5 = 13, so 13 − 5 = 8)
- Know all pairs of single-digit numbers that sum to numbers up to 20
“Can your child quickly recall facts like '7 + 3 = 10' (and later ones like '8 + 7 = 15') and immediately know the matching subtraction, like '10 − 3 = 7', without working it out from scratch?”
Curriculum record
- Type
- Procedural
- Subject
- Mathematics
- Domain
- Addition & Subtraction
- Age range
- Ages 5–8
Standards