Vocabulary in Practice 1 - Unit 9: Numbers

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Vocabulary in Practice 1 – Beginner

Learn the words in the notes below, then work through exercises A–F. Every answer is checked instantly. Original practice written for All English 4U.

1 Tier 1 – The Concept & Nuance: Cardinals, Ordinals & Pronunciation Stress

Mastering numbers requires recognizing the critical syllable stress between -teen (13–19) and -ty (30–90), as well as using ordinal numbers correctly for dates and rankings.

🔢 -teen vs -ty Contrast

13: thirTEEN vs 30: THIRty
14: fourTEEN vs 40: FORty
15: fifTEEN vs 50: FIFty
16: sixTEEN vs 60: SIXty

🥇 Ordinal Numbers (Dates/Ranks)

1st: first · 2nd: second
3rd: third · 4th: fourth
5th: fifth (spelling change)
21st: twenty-first

💯 Large Quantities

100: a / one hundred
1,000: a / one thousand
1,000,000: a / one million
0: zero / oh (phone numbers)

💡 Hundred Rule: When preceded by an exact number (two, three, five), words like hundred, thousand, million NEVER take plural -s (“three hundred people”, NOT “three hundreds”).

2 Tier 2 – Essential Collocations & Number Formats

⚖️ Exact Number vs General Quantity

Exact Number (no -s)	“There are five hundred* students in this school.”*
Hundreds OF (plural + of)	“Hundreds of* tourists visit the museum daily.”*

🔗 Everyday Number Collocations

– phone number: say digit by digit

– double four (44)

– a dozen (= 12 eggs/donuts)

– two and a half (2.5)

3 Tier 3 – Top 3 Common Learner Pitfalls

✗ ~~The concert had four thousands fans.~~

✓ The concert had four thousand fans.

– Rule: Do not add -s to hundred, thousand, million after specific numbers.

✗ ~~My birthday is on the three of May.~~

✓ My birthday is on the third of May (May 3rd).

– Rule: Always use ordinal numbers (1st, 2nd, 3rd, 4th…) for calendar dates.

✗ ~~forty is spelled fourty.~~

✓ 40 is spelled forty (no ‘u’).

– Rule: Four and fourteen have ‘u’, but forty drops the ‘u’.

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Tier 4 – Interactive Practice: Complete the number spelling and calculation drills in Exercises A–D below!