Tag: subtraction of integers on number line

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Multiple choice maths concept of directed numbers and number line subtraction of directed numbers subtraction of integers subtraction of integers on number line

$0$ is the __________ identify for whole numbers, whereas $1$ is the ___________ identify for whole numbers.

  1. Additive, Multiplicative

  2. Multiplicative, Additive

  3. Commutative, Additive

  4. Positive, Not-defined
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

When $0$ is added to any given whole number, the resultant number is the given whole number itself. This shows that $0$ is additive identity for whole number.

When $1$ is multiplied to any whole number, the resultant number is the number itself.
Here $0$ and $1$ are not making any change to the number.
Hence option A is correct.

Multiple choice maths concept of directed numbers and number line subtraction of directed numbers subtraction of integers subtraction of integers on number line

On a hill, the temperature at $8$ p.m. was $2^o$C but at the mid-night of the same day, it fell down to $-3^o$C. By how many degrees did the temperature fall?

  1. $6^o$C
  2. $5^o$C
  3. $2^o$C
  4. $3^o$C
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Temperature difference $\rightarrow$ Temperature at midnight $-$ Temperature at 8p.m.

Temperature difference $\rightarrow$ ($-3$) $-$ ($2$) $\rightarrow$ $-5$
Temperature fall by 5 degree.
Hemce Option B is correct.