Primary 1 Maths | Numbers to 20 Lesson-Prep Guide (for tutors)

Primary 1 Maths | Numbers to 20 Lesson-Prep Guide (for tutors) | Reading, comparing, ordinals

2026-11-08

Tutor lesson-prep guides · Primary Maths

The common Primary 1 error is not counting badly but confusing “how many” with “which position”. This lesson uses the same pile of counters to ask both questions so the pupil hears the difference.

Objectives — The pupil can: (1) read and write 0 to 20, including the -teen forms; (2) compare two numbers to 20 using greater-than, less-than and equals signs; (3) tell “there are 7” from “the 7th”; (4) explain that 13 is one ten and three ones using a ten-frame.

01 Prerequisites (3-minute check)

If any of these fails, fix it before the lesson starts.

Skill	Quick check	Pass mark
Counting	Can count from 1 to 10	pointing at each object
Numerals	Recognises 0–9	especially 6/9 and 2/5

02 Lesson flow (40 minutes)

Time	Stage	Tutor does	Student does
0–5 min	Diagnose	Show 8 counters and ask how many	counts correctly
5–17 min	Counting and writing	the -teen forms and their spelling	writes 11, 15, 19
17–27 min	Comparing and ordinals	same pile, two different questions	two different answers
27–35 min	Ten-frames	13 = one ten + three ones	fills a ten-frame for 13
35–40 min	Exit check	three oral questions	all correct

03 Teaching script (read it out)

Scene 1: Act 1: Count accurately, not quickly

Have the pupil point at each counter while saying one number per counter. The common fault is the finger moving faster than the voice, or skipping an object. Ask for three things at once: finger stops, voice speaks, eyes look. After 10, put the ten counters in a pile and add one more: “ten… one”, eleven. The English -teen forms are regular except thirteen and fifteen, which must be taught as spellings rather than built from three and five.

Tutor line: “How many counters? Point at each one and say one number for each.”If the pupil counts too fast, do not say “wrong”; ask for a second count at half the speed.

Scene 2: Act 2: How many is not which position

With the same 8 counters, ask “how many altogether” — the answer is 8. Then colour one red and ask “which position is the red one” — the answer is a place, not a total. In Cantonese the two questions differ by a single word, which is why the confusion persists. Ask both questions back to back with the same objects so the pupil hears the difference.

Tutor line: “I asked how many altogether, not which position. Listen to which one I asked.”Extension: line up 5 counters and ask “which one is third”, then “which three are they”, and have the pupil point at different ranges.

Scene 3: Act 3: Seeing ten in a ten-frame

A ten-frame is two rows of five. Put 13 counters in: the first row is full, the second row is full, the third row holds 3. The pupil sees two full rows plus three at a glance, which is 10 + 3. This builds place value concretely and leads directly to three-digit numbers in Primary 2.

Tutor line: “This frame holds 10. You filled two rows, so that is two tens, plus three ones. How many altogether?”Note: Primary 1 does not need the terms “ones place” and “tens place”, but the pupil must feel that 10 is one bundle.

04 Question types and worked steps

Type	Example	Steps
Read and write: numeral to word and back	read the question, recognise the shape, write, check once	watch 6/9 and 2/5
Compare: fill in greater-than, less-than or equals	count both sides, compare, write the sign, read it aloud	the open side faces the larger number
Ordinal: which position	circle the word “position”, count from the start, give the place	the answer is never bigger than the total
Place value: 13 = ? tens ? ones	use the ten-frame, count full rows, count the rest	one full row is one ten

Sanity check (teach this): Keep the range at 0 to 20; do not slip to 25 or 30. A ten-frame is 2×5 = 10 cells, not ten rows. In English, thirteen and fifteen are irregular and must be taught as spellings.

05 Independent practice (3 questions)

Question	Answer	What to watch
Count: ★★★★★★★★ how many?	8	point at each one
Write 17 in words	seventeen	not “one seven”
12 ○ 9 — fill in greater-than, less-than or equals	>	12 is more than 9
Six people in a row; who is fourth?	the 4th	position, not total
13 = ? tens + ? ones	1 ten + 3 ones	ten-frame: one full row + 3

06 Common mistakes and what to say

Mistake	Student writes	Say this
Answering “how many” with a position	“the 5th” when asked how many	“I asked how many altogether, not which position.”
Writing 11–19 as “one ten one”	writing “oneteen” for 11	“We say eleven, not one-one.”
Reversing the comparison sign	writing 9 > 12	“The open side faces the bigger number: 12 is bigger, so it faces 12.”
Skipping an object while counting	counting 8 as 7	“Point at each one and say one number for each. No rush.”

07 Homework (paper, section and question numbers)

Numbers to 20 practice (in-school) — questions 1–5: counting and writing
Comparing and ordinals practice (in-school) — questions 1–4: >, <, =

08 Exit check (last 5 minutes)

Question	Answer	Decision
Count: ●●●●●●● how many?	7	if wrong: redo one-by-one counting
Write 15 in words	fifteen	if wrong: reteach the -teen pattern
8 ○ 11 — fill in the sign	<	if wrong: reteach “open side to the bigger number”

09 Tutor FAQ

Why start with ten-frames instead of column addition?

A ten-frame lets the pupil see that 10 is one bundle, which is the concrete basis of place value. Column addition is symbol manipulation; without the concrete stage it becomes a memorised procedure in Primary 2.

The pupil counts to 20 but often misses one. What helps?

Usually the hand and voice are out of step. Require three things together — finger stops, voice speaks, eyes look — and halve the speed. Accuracy matters more than speed.

How do I separate “how many” from “which position”?

Ask both questions back to back with the same objects. Point at the whole pile for “how many” and at a single item for “which position”.

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A TutorZone lesson-prep guide. Written by the TutorZone team; questions and lesson flow are original and are not taken from any school or publisher material.