Question

measurement

add the following and answer In the decinal forms ?

115 l and 23 dal 157 cl​

Answer 1

Answer:

. 242/1000 = 242 × 10-3

⇒ 242/1000 = 0.242

(∵ 242 ÷ 1000 = 0.242)

(ii). 354/500 = (354/5) × 10-2

⇒ 354/500 = 70.8 × 10-2

Or 354/500 = 70.8 ÷ 100

⇒ 354/500 = 0.708

(iii). 2/5 = 2 ÷ 5

⇒ 2/5 = 0.4

(iv). 115/4 = 115 ÷ 4

⇒ 115/4 = 28.75

II. (i). 2/3 = 2 ÷ 3

⇒ 2/3 = 0.6666666…

This is clearly a repeating or recurring decimal. Thus, round-off the decimal in 2-digit or so after the decimal point.

⇒ 2/3 = 0.67

(ii). -25/36 = -25 ÷ 36

⇒ -25/36 = -0.6944444…

This is clearly a repeating or recurring decimal. Thus, by rounding off in 4-digit or so after the decimal point.

⇒ -25/36 = -0.6944

(iii). 22/7 = 22 ÷ 7

⇒ 22/7 = 3.142857143…

This clearly is non-repeating, non-terminating decimal, which is a decimal number which continues endlessly with no group of digits repeating endlessly.

Thus, take only 2 or 3 digit after decimal point.

⇒ 22/7 = 3.14

This number is also called π (pi).

(iv). 11/9 = 11 ÷ 9

⇒ 11/9 = 1.2222222…

This is a repeating or recurring decimal. Thus, round it off to 2 or so digits after the decimal point.

⇒ 11/9 = 1.22