Mathematics · Primary 1

Active learning ideas

Reading and Writing Numbers to 100

Active, hands-on practice helps students connect the abstract symbols of numerals with the concrete meanings of number words and place value. Moving, building, and sorting foster deep understanding that paper drills alone cannot provide. This builds confidence and accuracy in reading and writing numbers up to 100.

• MOE Syllabus Outcomes
• MOE: N(iv).4
• MOE: N(iv).5

• 15–30 min
• Pairs → Whole Class
• 4 activities

Activity 01

• Stations Rotation
• 20 min · Pairs

Pair Matching: Numeral-Word Cards

Prepare cards with numerals 11-99 and matching number words. Pairs shuffle and match sets, saying the number aloud for each pair. After 10 matches, partners switch decks and record three new matches in journals.

How do we read two-digit numbers correctly?

Facilitation Tip

During Pair Matching: Numeral-Word Cards, circulate and listen for students correcting each other when they read numbers like 'thirty-two' as 'three two'.

What to look for

Write a list of numbers (e.g., 15, 42, 70, 99) on the board. Ask students to write the number word for each on a mini-whiteboard or paper. Review answers together, focusing on correct hyphenation and reading of tens.

• Remember
• Understand
• Apply
• Analyze
• Self-Management
• Relationship Skills

Activity 02

• Stations Rotation
• 30 min · Small Groups

Small Group: Base-10 Build and Label

Give groups base-10 blocks or straw bundles for tens and ones. Teacher calls a number word; groups build the numeral, write it, and label with the word. Groups share one build with the class.

How do we write the number word for numbers between 21 and 100?

Facilitation Tip

During Small Group: Base-10 Build and Label, ensure every student holds at least one block and says the number aloud before writing it on the recording sheet.

What to look for

Give each student a card with a two-digit number (e.g., 38, 50, 81). Ask them to write the number word for it and draw a simple representation showing the tens and ones (e.g., 3 groups of 10 and 8 ones for 38).

• Remember
• Understand
• Apply
• Analyze
• Self-Management
• Relationship Skills

Activity 03

• Stations Rotation
• 25 min · Whole Class

Whole Class: Number Line Relay

Set up a large number line 0-100 on the floor. Divide class into teams. Teacher says a number word; first student runs to place, writes numeral on sticky note, says it back, and tags next teammate.

What is special about the numbers 10, 20, 30 … 100?

Facilitation Tip

During Whole Class: Number Line Relay, stand near the line and pause students to ask, 'What number comes after 40? How do you know?' to keep thinking aloud.

What to look for

Present the numbers 20, 25, and 30. Ask students: 'What do you notice about the way we say 20 and 30 compared to 25? What is special about numbers like 10, 20, 30, 40, 50, 60, 70, 80, 90, and 100?'

• Remember
• Understand
• Apply
• Analyze
• Self-Management
• Relationship Skills

Activity 04

• Stations Rotation
• 15 min · Individual

Individual: Hyphen Hunt Worksheet

Students receive mixed number words like 'twenty one'. They rewrite correctly with hyphens, circle tens patterns, and draw base-10 sketches. Circulate to check and praise progress.

How do we read two-digit numbers correctly?

Facilitation Tip

During Individual: Hyphen Hunt Worksheet, model circling the first incorrect word in a sample sentence to show students how to self-check their answers.

What to look for

Write a list of numbers (e.g., 15, 42, 70, 99) on the board. Ask students to write the number word for each on a mini-whiteboard or paper. Review answers together, focusing on correct hyphenation and reading of tens.

• Remember
• Understand
• Apply
• Analyze
• Self-Management
• Relationship Skills

A few notes on teaching this unit

Teach number words by linking them directly to base-10 models, not isolated memorization. Avoid teaching 'twenty' as a single unit; break it into tens and ones to build place value understanding. Research shows that students who physically manipulate blocks while verbalizing the number write and read the words more accurately later. Use choral responses and peer teaching to reinforce correct pronunciation of hyphenated words.

By the end of these activities, students will read two-digit numbers fluently using the tens-first rule and write number words with correct hyphenation. They will also recognize multiples of 10 as key place-value anchors. Success looks like accurate reading, writing, and explaining of numbers during group tasks.

---

Watch Out for These Misconceptions

• During Pair Matching: Numeral-Word Cards, watch for students reading 23 as 'two three' instead of 'twenty-three'.

  Have students build the number with base-10 blocks first, then say the number aloud together, emphasizing the tens place before the ones. Ask peers to confirm if the reading matches the model.

• During Small Group: Base-10 Build and Label, watch for students writing 'twentyone' without a space or hyphen.

  Display a word bank with correctly hyphenated words on the table. Students must find and copy the correct form before labeling their model, discussing why the hyphen is necessary.

• During Whole Class: Number Line Relay, watch for students treating multiples of 10 like 30 as 'three zero' rather than special tens anchors.

  Color-code the tens on the number line and have students jump to each multiple of 10 while chanting, 'Ten, twenty, thirty...' to highlight their role as counting landmarks.

---

Methods used in this brief

• Stations Rotation