Number bonds

PROCEDURAL

Mathematics›Addition & Subtraction|Ages 5—6|ID: mt_s2mfRBoTal

Recall number bonds (addition and related subtraction facts) within 20

Mastery Evidence

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

Assessment Prompt

“Can [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 Standards1 alignment

Maths/Y1/AS/2The national curriculum in England

Number bonds and subtraction facts within 20

Represent and use number bonds and related subtraction facts within 20.

Mathematics · Key Stage 1

Prerequisites2

Number bonds to 9
hardAges 4—6
Fluent adding and subtracting within 5
hardAges 5—6

Show full prerequisite tree

Number bonds to 9 hard
Number bonds within 20 builds on knowing bonds to 10
- Numbers up to 10 into pairs hard
  Making 10 is a specific application of decomposing numbers into pairs
  - Addition as combining or putting together two hard
    Decomposing numbers into pairs requires understanding addition as combining
    - How Many in Total? hard
      Understanding addition as combining groups requires knowing numbers represent quantities (cardinality)
      - One-to-one counting hard
        Cardinality principle builds on one-to-one correspondence — you must count correctly to know the last number tells 'how many'
Fluent adding and subtracting within 5 hard
Recalling bonds within 20 builds on fluency within 5
- Addition as combining or putting together two hard
  Fluency with addition within 5 requires understanding addition as combining
  - How Many in Total? hard
    Understanding addition as combining groups requires knowing numbers represent quantities (cardinality)
    - One-to-one counting hard
      Cardinality principle builds on one-to-one correspondence — you must count correctly to know the last number tells 'how many'
- Subtraction as taking away or separating hard
  Fluency with subtraction within 5 requires understanding subtraction as taking away
  - How Many in Total? hard
    Understanding subtraction as taking away requires knowing numbers represent quantities (cardinality)
    - One-to-one counting hard
      Cardinality principle builds on one-to-one correspondence — you must count correctly to know the last number tells 'how many'

Unlocks2

Place value understanding and number facts
softAges 6—7
Adding and subtracting
hardAges 5—6