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)
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Teaching approaches
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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.
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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