1. State the idea
Connect a real quantity, a visual model and a written numeral, then use number order and one more/one less from 0 to 20.
Build → See → Write → Order → Apply → Check
AC9MFN01 • Foundation Maths
Numbers to 20
Name, represent and order numbers
Learning goal: Connect a real quantity, a visual model and a written numeral, then use number order and one more/one less from 0 to 20.
Materials: blocks/counters, number cards 0–20, visible 0–20 number line.
Core routine: Build → See → Write → Order → Apply → Check.
Teach for understanding: return to the concrete or visual model whenever the student guesses.
🎯 Learn🎨 Teach It🔎 Apply🖐 Try It⚠ Fix It✏ Quick Check
2. Build → See → Write 12
BUILD
■■■■■■■■■■ + ■■
12 is 10 and 2 more.
SEE
■ ■ ■ ■ ■ ■ ■ □ □ □
■ ■ ■ ■ ■ □ □ □ □ □
10 + 2 = 12
■ ■ ■ ■ ■ □ □ □ □ □
10 + 2 = 12
WRITE
12
The picture and numeral show the same quantity.
3. Put it in order
0 — 1 — 2 — 3 — 4 — 5 — 6 — 7 — 8 — 9 — 10 — 11 — 12 — 13 — 14 — 15 — 16 — 17 — 18 — 19 — 20
13 ← 14 → 15
Say: “13 is one less. 15 is one more.”
4. Guided activities
- Fetch 9 objects and count each as it is placed down.
- Show 14 and ask for the number before and after.
- Count 0 → 20, then 20 → 0.
5. Correct misconceptions
❌ Double counting: Move each object once as it is counted.
❌ Teen reversal: Rebuild 14 as 10 + 4 before writing it.
❌ Zero forgotten: Show an empty collection and label it 0.
6. Mixed questions
1
Count 8 dots: ● ● ● ● ● ● ● ●
Count 8 dots: ● ● ● ● ● ● ● ●
2
Order 16, 5, 11, 2 from smallest to largest.
Order 16, 5, 11, 2 from smallest to largest.
3
Complete: ___ ← 14 → ___
Complete: ___ ← 14 → ___
4
Mia has 9 counters and gets 1 more. How many now?
Mia has 9 counters and gets 1 more. How many now?