Number, NAPX-p73014v03

Question

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Worked Solution

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Variant 0

DifficultyLevel

528

Question

Idriss thinks of a number.

He writes these clues for his classmates.

  • The number is an odd number
  • It is greater than 300 but less than 500
  • The tens digit is the same as its hundreds digit

What is Idriss' number?

Worked Solution

By elimination:

Number is between 300 and 500 ⇒ Eliminate 665.

Ten's digit = hundred's digit

⇒ Eliminate 363 and 477.

∴\therefore Number must be 447.

Question Type

Multiple Choice (One Answer)

Variables

Variable nameVariable value
question
Idriss thinks of a number. He writes these clues for his classmates.
* **The number is an odd number** * **It is greater than 300 but less than 500** * **The tens digit is the same as its hundreds digit**

What is Idriss' number?
workedSolution
By elimination: Number is between 300 and 500 ⇒ Eliminate 665. Ten's digit = hundred's digit ⇒ Eliminate 363 and 477. $\therefore$ Number must be 447.
correctAnswer
447

Answers

Is Correct?Answer
x

363

✓

447

x

477

x

665

Variant 1

DifficultyLevel

530

Question

Fatima thinks of a number.

She writes these clues so her friends can guess it.

  • The number is an even number
  • It is greater than 100 but less than 1000
  • The tens digit is the same as its hundreds digit

What is Fatima's's number?

Worked Solution

By elimination:

Number is even ⇒ Eliminate 355 and 883

Ten's digit = hundred's digit

⇒ Eliminate 808.

∴\therefore Number must be 992.

Question Type

Multiple Choice (One Answer)

Variables

Variable nameVariable value
question
Fatima thinks of a number. She writes these clues so her friends can guess it.
* **The number is an even number** * **It is greater than 100 but less than 1000** * **The tens digit is the same as its hundreds digit**

What is Fatima's's number?
workedSolution
By elimination: Number is even ⇒ Eliminate 355 and 883 Ten's digit = hundred's digit ⇒ Eliminate 808. $\therefore$ Number must be 992.
correctAnswer
992

Answers

Is Correct?Answer
x

355

x

808

x

883

✓

992

Variant 2

DifficultyLevel

532

Question

Yasmine thinks of a number.

She writes these clues so her friends can guess it.

  • The number is an odd number
  • It is greater than 500 but less than 800
  • The ones digit is the same as its hundreds digit

What is Yasmine's number?

Worked Solution

By elimination:

Number is odd ⇒ Eliminate 606

One's digits = hundred's digit

⇒ Eliminate 655 and 779.

∴\therefore Number must be 737.

Question Type

Multiple Choice (One Answer)

Variables

Variable nameVariable value
question
Yasmine thinks of a number. She writes these clues so her friends can guess it.
* **The number is an odd number** * **It is greater than 500 but less than 800** * **The ones digit is the same as its hundreds digit**

What is Yasmine's number?
workedSolution
By elimination: Number is odd ⇒ Eliminate 606 One's digits = hundred's digit ⇒ Eliminate 655 and 779. $\therefore$ Number must be 737.
correctAnswer
737

Answers

Is Correct?Answer
x

655

x

606

✓

737

x

779

Variant 3

DifficultyLevel

523

Question

Jade writes a number on a piece of paper and covers it.

She gives her friend the following clues about her number.

  • The number is less than 1000
  • The number has 80 tens
  • The digit in the ones place is half the digit in the hundreds place.

What is Jade's number?

Worked Solution

Consider the following clues,

Number has 80 tens,

⇒ Number is 3 digits, starting with 80_

The “ones” digit is half the “hundreds” digit,

∴\therefore Number must be 804.

Question Type

Multiple Choice (One Answer)

Variables

Variable nameVariable value
question
Jade writes a number on a piece of paper and covers it. She gives her friend the following clues about her number.
* **The number is less than 1000** * **The number has 80 tens** * **The digit in the ones place is half the digit in the hundreds place.**

What is Jade's number?
workedSolution
Consider the following clues, Number has 80 tens, ⇒ Number is 3 digits, starting with 80_ The “ones” digit is half the “hundreds” digit, $\therefore$ Number must be 804.
correctAnswer
804

Answers

Is Correct?Answer
x

842

✓

804

x

84

x

80

Variant 4

DifficultyLevel

521

Question

Wyatt writes a number on a piece of paper and hides it.

He gives his friend the following clues about his number.


  • The number is less than 600
  • The number has 40 tens
  • The digit in the ones place is two less than the digit in the hundreds place.

What is Wyatt's number?

Worked Solution

Consider the following clues,

Number has 40 tens,

⇒ Number is 3 digits, starting with 40_

The “ones” digit is two less than the “hundreds” digit,

∴\therefore Number must be 402.

Question Type

Multiple Choice (One Answer)

Variables

Variable nameVariable value
question
Wyatt writes a number on a piece of paper and hides it. He gives his friend the following clues about his number.
* **The number is less than 600** * **The number has 40 tens** * **The digit in the ones place is two less than the digit in the hundreds place.**

What is Wyatt's number?
workedSolution
Consider the following clues, Number has 40 tens, ⇒ Number is 3 digits, starting with 40_ The “ones” digit is two less than the “hundreds” digit, $\therefore$ Number must be 402.
correctAnswer
402

Answers

Is Correct?Answer
x

40

x

42

x

420

✓

402

Tags