Tag: maths

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Questions Related to maths

Multiple choice maths decimal numbers adding and subtracting decimals addition and subtraction of decimals operations on decimals

$3.\overline { 87 } -2.\overline { 59 } =$?

  1. $1.20$
  2. $1.\overline { 2 } $
  3. $1.\overline { 27 } $
  4. $1.\overline { 28 } $
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

$3.\overline { 87 } -2.\overline { 59 } =\left( 3+0.\overline { 87 }  \right) -\left( 2+0.\overline { 59 }  \right) $

$=\left( 3+\dfrac { 87 }{ 99 }  \right) -\left( 2+\dfrac { 59 }{ 99 }  \right) $

$=1+\left( \dfrac { 87 }{ 99 } -\dfrac { 59 }{ 99 }  \right) $

$=1+\dfrac { 28 }{ 99 } $

$=1.\overline { 28 } $.

Multiple choice maths decimal numbers adding and subtracting decimals addition and subtraction of decimals operations on decimals

The value of 30.5 - 30.4 + 30.3 - 30.2 + 30.1 - 30 + 29.9 - 29.8 + 29.7 - 29.6 + 29.5 - 29.4 + 29.3 - 29.2 + 29.1 - 29.0 = _________.

  1. $0.8$
  2. $0.7$
  3. $0.6$
  4. $1.8$
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

We have, $(30.5 - 30.4) + (30.3 - 30.2) + (30.1 - 30) + (29.9 - 29.8) + (29.7 - 29.6) + (29.5 - 29.4) + (29.3 - 29.2) + (29.1 - 29.0)$
$= 0.1+ 0.1 + 0.1 + 0.1 + 0.1+ 0.1 + 0.1 + 0.1$
$= 0.8$.

Multiple choice maths decimal numbers adding and subtracting decimals addition and subtraction of decimals operations on decimals





A A B B C C D D E E
M S M S M S M S M S
$2006$ $2.8$ $1.3$ $3.3$ $2.2$ $2.6$ $1.7$ $3.0$ $2.2$ $1.9$ $1.4$
$2007$ $3.2$ $2.0$ $2.4$ $1.6$ $2.2$ $1.5$ $2.5$ $1.9$ $2.0$ $1.7$
$2008$ $1.9$ $0.9$ $2.9$ $1.6$ $2.1$ $1.0$ $2.3$ $1.5$ $1.6$ $1.1$
$2009$ $1.0$ $0.4$ $2.4$ $1.3$ $2.8$ $1.4$ $2.1$ $1.2$ $3.2$ $2.5$
$2010$ $2.5$ $1.5$ $2.3$ $1.2$ $2.6$ $2.1$ $1.8$ $1.1$ $3.1$ $2.6$


What is the total number of units manufactured by company C over all  the years together?

  1. $14.20$
  2. $10.30$
  3. $12.30$
  4. $13.20$
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Total number of units manufactured by company C over all the years together

=$2.6+2.2+2.1+2.8+2.6 = 12.3 $