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TOEIC Link Part 5: amount versus number

Amount and number both mean "how much/how many," but Part 5 makes you choose based on the noun that follows: amount goes with noncount nouns, number with countable plurals. The answer is decided entirely by whether you can count the noun, not by the size of the quantity, so the fastest read is to look past the blank at the noun it measures.

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TOEIC Link Part 5: amount versus number

Amount and number look interchangeable — both answer "how much is there?" — but Part 5 treats them as a clean grammar test, not a meaning test. The rule has nothing to do with how big the quantity is. It depends only on whether the noun being measured is countable or noncountable. Once you can spot that, the choice between amount and number chooses itself, and you never have to think about which "feels" bigger.

The core rule: count it or measure it

  • amount of goes with noncount nouns — things measured as a mass, not counted one by one: amount of work, amount of time, amount of money, amount of information.
  • number of goes with countable plural nouns — things you can count individually: number of employees, number of orders, number of mistakes, number of days.

The deciding question is simple: can you put a number directly in front of this noun? You can say three orders and five employees, so those take number of. You cannot say three works or five informations, so those take amount of. This is the same count/noncount split that decides fewer versus less — amount/number is just the noun-phrase version of the same distinction.

Why size is a distractor

Part 5 writers know test-takers reach for amount when the quantity feels large and number when it feels small or specific. That instinct is wrong. Look at the noun, not the scale:

  • a large amount of data — data is treated as noncount, so amount is correct even though the quantity is huge.
  • a small number of complaints — complaints is countable, so number is correct even though the quantity is tiny.

Reverse them and they break: a large number of data and a small amount of complaints are both wrong. The size adjective (large, small, significant) is a decoy; the only thing that settles the answer is the countability of the noun after of. This "read the structure, not the impression" discipline runs through every Part 5 quantity item, including much, many, few, and little.

Subject-verb agreement: the verb follows the real subject

A second trap hides in agreement. When the number of or an amount of is the subject, the verb agrees with the head noun (number/amount), which is singular:

The number of applicants has increased. (not have)

But a number of — with the indefinite article — works as a plural quantifier meaning "several," and takes a plural verb:

A number of applicants have withdrawn. (here a number of = "several")

This the number (singular) versus a number (plural-quantifier) contrast is a favorite, so lock it in: the number takes a singular verb; a number of takes a plural verb.

A fast decision procedure

When the blank sits before of + noun, run three steps:

  1. Find the noun after of. Ignore the adjective in front of it (large, small, total).
  2. Test countability. Can you put a number in front of it (one order, two orders)? If yes, it is countable, so choose number of. If the noun is a mass or abstract idea with no plural, choose amount of.
  3. If it's the subject, check the article. The number ... has; a number of ... have.

Worked examples:

  • The company received a record number of inquiries. — inquiries is countable, so number.
  • Completing the audit requires a substantial amount of time. — time is noncount, so amount.
  • A growing number of customers prefer self-checkout. — customers is countable and a ... of signals "several," so number with the plural verb prefer.

Watch for nouns that flip

A few nouns are countable or noncount depending on meaning, and Part 5 occasionally exploits that.

  • experience: noncount when it means knowledge (amount of experience), countable when it means events (number of experiences).
  • work: noncount as labor (amount of work), countable as artworks (number of works).
  • business: noncount as activity/trade (amount of business), countable as companies (number of businesses).

When you see one of these, decide the sense first, then apply the count/noncount rule. This is the same "which question am I actually answering?" habit covered in our guide to word choice versus word form.

Quick reference

  • amount of + noncount mass/abstract noun (time, money, work, information, data).
  • number of + countable plural noun (people, orders, days, mistakes).
  • The size of the quantity is irrelevant — only countability matters.
  • The number of takes a singular verb; a number of takes a plural verb.
  • Watch nouns that switch (experience, work, business) — pick the meaning, then apply the rule.

Make this a one-look reflex: glance past the blank to the noun after of, ask "can I count it?", and the answer is locked before you even read the options.