Tag: mental multiplication

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Questions Related to mental multiplication

Multiple choice maths ways to multiply and divide mental multiplication multiplication methods multiplication of numbers

Division of numbers is performed when we ________ certain quantities.

  1. Distribute

  2. Share

  3. Divide

  4. Add
Reveal answer Fill a bubble to check yourself
A,B,C Correct answer
Explanation
Division is splitting into equal parts or groups. It is the result of "fair sharing".
Example: there are $12$ chocolates, and $3$ friends want to share them, how do they divide the chocolates?
Answer: They should get $4$ each.

We use the ÷ symbol, or sometimes the / symbol to mean divide:
$12 ÷ 3 = 4$
$12 / 3 = 4$
Multiple choice maths ways to multiply and divide mental multiplication multiplication methods multiplication of numbers

The product of two consecutive natural numbers is always ________.

  1. An even number

  2. An odd number

  3. A prime number

  4. Divisible by 3
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

We know that amongst two consecutive natural numbers, one is even and one is odd.

Let even number be $2n$ and odd be $2n+1$
Their product gives $2n(2n+1)$ which is a multiple of $2$, hence it is an even number.

Multiple choice maths ways to multiply and divide mental multiplication multiplication methods multiplication of numbers

A tyre factory produces $6348$ tyres a day. How many tyres will the factory produce in $460$ days?

  1. $29000$ tyres
  2. $2920080$ tyres
  3. $78546080$ tyres
  4. $5667772$ tyres
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation
Since, the factory produces $6348$ tyres in one day.
$\therefore $ it will produce  460 times the  product in one day in $460$ days.

$\therefore $ $460\times 6348=2920080$.

Multiple choice maths ways to multiply and divide mental multiplication multiplication methods multiplication of numbers

The unit's digit in the product $274 \times 318 \times 577 \times 313$ is:

  1. 2

  2. 3

  3. 4

  4. 5
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

$ The\quad units\quad place\quad numbers\quad are\quad 4,\quad 8,\quad 7\quad and\quad 3.\ 4\times 8=32\longrightarrow \quad units\quad place\quad number\quad is\quad 2\ 2\times 7=14\longrightarrow \quad units\quad place\quad number\quad is\quad 4\ 4\times 3=12\longrightarrow \quad units\quad place\quad number\quad is\quad 2\ Answer-\quad Option\quad A $

Multiple choice maths ways to multiply and divide mental multiplication multiplication methods multiplication of numbers

Product of $7,986$ and $548$ is

  1. $1,35,562$
  2. $43,76,328$
  3. $1,35,862$
  4. $1,35,462$
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Unit digits of both numbers are $6$ and $8$. 

On multiplying the unit digits we get,
$6\times 8=48$
So, the unit digit of the product will be $8$.
There is only one option whose unit digit is $8$ i.e. option B.
So, correct answer is opiton B.