Primary 1 Maths | Numbers to 100 Lesson-Prep Guide (for tutors)

Primary 1 Maths | Numbers to 100 Lesson-Prep Guide (for tutors) | Place value, comparing, bundling

2026-11-08

Tutor lesson-prep guides · Primary Maths

The common Primary 1 error is not failing to count to 100 but writing 34 as 43. The cause is not carelessness: the idea that the tens digit sits on the left is not yet secure. This lesson makes position visible by bundling counters.

Objectives — The pupil can: (1) read and write 0 to 100, including the tens-and-ones structure of 21 to 99; (2) compare two numbers within 100 by looking at the tens digit first; (3) explain that ten ones bundled make one ten; (4) count on or back from any number.

01 Prerequisites (3-minute check)

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

Skill	Quick check	Pass mark
Numbers to 20	reads and writes 0 to 20	including the irregular -teen forms
Ten-frame	knows 10 is one bundle	a full row is one ten

02 Lesson flow (40 minutes)

Time	Stage	Tutor does	Student does
0–5 min	Diagnose	show 34 counters and ask how many	counts correctly
5–17 min	Bundling tens	bind 10 counters into a bundle; count 3 bundles + 4 loose	says three tens and four ones
17–27 min	Comparing	29 against 31	compare the tens first
27–35 min	What 100 means	10 bundles arranged as a square	counts to 100
35–40 min	Exit check	three questions	all correct

03 Teaching script (read it out)

Scene 1: Act 1: Ten ones make one ten

This is the core of the lesson. Give the pupil 34 counters and ask them to bundle every 10 with a rubber band. Three bundles and four loose counters remain. Ask how many bundles and how many loose. The answer is three tens and four ones, written 34. Only after bundling by hand does the left digit mean bundles and the right digit mean loose counters.

Tutor line: “How many bundles did you make? How many loose are left? Three bundles and four loose. Is that 34 or 43?”

Scene 2: Act 2: Compare the tens digit first

Use 29 against 31 rather than 34 against 43. With 34 and 43 the surface digits give the right answer by accident, so a wrong method can still be marked correct. With 29 and 31 the tens digit decides: 3 tens beats 2 tens, so 31 is larger even though 9 is larger than 1. The rule to establish is: compare the tens, and only compare the ones when the tens are equal.

Tutor line: “29 or 31, which is bigger? Do not look at the ones. Look at the tens. Two tens or three tens, which is more?”

Scene 3: Act 3: 100 is ten tens

Arrange 10 bundles of 10 as ten rows of ten, forming a square. Say: ten tens make one hundred. This image carries straight into three-digit numbers in Primary 2. Do not rush to write the numeral first; have the pupil count: ten in a row, ten rows, one hundred.

Tutor line: “How many in one row? What about ten rows? Ten tens make one hundred.”

04 Question types and worked steps

Type	Example	Steps
Read and write: numeral to word and back	identify the place, write the tens, write the ones, read it once	34 is thirty-four, not forty-three
Place value: 34 = ? tens ? ones	use the bundles, count bundles, count loose	left is tens, right is ones
Comparing: fill in greater, less or equal	compare tens, then ones, then write the sign	never judge by the first digit alone
Counting: from 47 to 53	set the start, add one each time, carry at ten	after 49 comes 50

Sanity check (teach this): Keep the range at 0 to 100; do not use 105 or 250. In English, 21 to 99 take a hyphen (thirty-four), never thirtyfour. For comparing, always include a pair that reverses (29 against 31), or a wrong method will score by luck.

05 Independent practice (3 questions)

Question	Answer	What to watch
Write 34 in words	thirty-four	tens first, with a hyphen
47 = ? tens ? ones	4 tens and 7 ones	confirm with bundles
Which is larger, 29 or 31?	31	compare the tens: 3 beats 2
Count from 47 to 53	47, 48, 49, 50, 51, 52, 53	49 carries to 50
How much is ten tens?	100	arrange as ten by ten

06 Common mistakes and what to say

Mistake	Student writes	Say this
Reversing the place value	writing thirty-four as 43	“The left digit is tens, the right is ones. You have three bundles and four loose, so 34.”
Writing 410 after 49	counting 49 then 410	“Add one to 49 and the tens go up one: 50.”
Comparing by the first digit only	saying 29 is larger than 31	“Compare the tens first: two tens against three tens.”
Dropping “ty” in speech	reading 34 as three-four	“Thirty-four, not three-four. Thirty is three tens.”

07 Homework (paper, section and question numbers)

Numbers to 100 and place value practice (in-school) — questions 1–6: place value and writing
Primary 1 maths paper 1 — questions 1–5: comparing and counting

08 Exit check (last 5 minutes)

Question	Answer	Decision
56 = ? tens ? ones	5 tens and 6 ones	if wrong: redo bundling
Which is larger, 38 or 41?	41	if wrong: reteach tens first
Count from 97 to 100	97, 98, 99, 100	if wrong: reteach carrying

09 Tutor FAQ

Why bundle with rubber bands instead of teaching place value directly?

A Primary 1 pupil is still at the concrete stage. Binding ten counters into one bundle is what makes the left digit mean bundles. Taught as a rule alone, the pupil reverses 34 and 43.

The pupil counts to 100 but cannot write the numerals. What helps?

Place-value writing is not yet secure. Return to bundles and require four spoken steps: count bundles, write the tens, count loose, write the ones.

Should I introduce three-digit numbers now?

No. The Primary 1 curriculum stops at 100. Three digits now would blur place value; leave it for Primary 2.

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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.