Tag: mental multiplication

Questions Related to mental multiplication

Divide : $16974\div 23\div 2$

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

  1. $738$

  2. $1476$

  3. $369$

  4. $1567$

Show answer
Correct Option: C
Explanation:

$16974\div 23\div 2$

$=(16974\div 23)\div 2\ =738\div 2\ =369$
Hence, the answer is $369$.

Evaluate:$12340\times 23=$

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

  1. $12,345$

  2. $65,2350$

  3. $28,3820$

  4. $56,234$

Show answer
Correct Option: C
Explanation:

$\ \ \ \ 12340\ \times \ \ \ \ \ \ 23 \ ---- \ \ \ \ \ \ \ 37020 \ + 246800 \ ---- \ \ \ \ \ 283820$

$12\times 4356= ?$

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

  1. $52,272$

  2. $52,256$

  3. $52,562$

  4. $52,632$

Show answer
Correct Option: A
Explanation:
By law of commutation,
$12 \times 4356 = 4356 \times 12$

By calculation,
$\ \ \ \ \ \ \ \ 4356 \\ \times\ \ \ \ \ \ \ 12 \\ ----$
$\ \ \ \ \ \ 8712 \\ + 43560 \\ ----- \\ \ \ \ \ 52272$

Evaluate: $234\times 0$

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

  1. $234$

  2. $100$

  3. $0$

  4. $1$

Show answer
Correct Option: C
Explanation:

Any number multiplied by $0$ gives $0$ itself.

$\Rightarrow 234\times 0 = 0$

Divide : $0\div 23329$

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

  1. $0$

  2. $1$

  3. $23329$

  4. Not defined

Show answer
Correct Option: A
Explanation:

$0$ when divided by anything results as $0$.

$\therefore 0 \div 23329 = 0$
Hence, answer is $0$.

Which of the following is NOT true?

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

  1. $959877\times 0=0$

  2. $959877\times 1=959877$

  3. $959877\times 10=0$

  4. None of these

Show answer
Correct Option: C
Explanation:

$959877\times 10=9598770$

Hence option C is not true.

Which of the following options is correct?
Statement 1: If $7$ friends divide $76895$ coloured beads amongst themselves, then each will get $10984$ coloured beads
Statement 2: If $16$ families went on a trip and pay Rs. $216352$ in total, then each family will pay Rs. $13522$.

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

  1. Both statement 1 and statement 2 are true

  2. Statement 1 is true but statement-2 is false

  3. Statement-1 is false but statement-2 is true

  4. Both statement-1 and statement-2 are false

Show answer
Correct Option: C
Explanation:

Statement 1-If $7$ friends divide $76895$ beads, each friend will get $(76859\div 7)$ beads i.e., $10985$ beads
So, statement 1 is false
Statement 2: Each family will pay
Rs. $(216352\div 16)=Rs.13552$

A generator consumes 2.875 litres of diesel per hour.The quantity of diesel required to run the generator for 24 hours is ______ .

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

  1. $45$ litres

  2. $55$ litres

  3. $72$ litres

  4. $69$ litres

Show answer
Correct Option: D
Explanation:

$\Rightarrow$  Diesel consumes by generator in $1\,hour$ = $2.875\,liters.$

$\Rightarrow$  Diesel consumes by generator in $24\,hours=24\times 2.875\,liters$
$\therefore$  Diesel consumes by generator in $24\,hours=69\,liters$.

What is the number in the START box?
$\boxed { START } \rightarrow \boxed { \div 16 } \rightarrow \boxed { \times 20 } \rightarrow \boxed { 132820 } $

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

  1. $116256$

  2. $106256$

  3. $384120$

  4. $102656$

Show answer
Correct Option: B
Explanation:

$132820\div 20=6641$
and $6641\times 16=106256$

Hence the correct answer is option B.

A machine produces $2800$ screws in a day. Which of the following is the best estimate of the number of screws produced in 2 days?

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

  1. $3500$

  2. $5000$

  3. $3000$

  4. $2900$

Show answer
Correct Option: B
Explanation:

A machine produces $2800$ screws in a day.

Hence it will produce $2800\times2$ screws in $2$ days
$=5600$ screws in $2$ days
The best estimate of the number of screws produced in $2$ days is $5000$
Hence Option B