4.2.2 Decimals, PT3 Practice


Question 5:
Calculate the value of 4 5 +15.4÷4 and express the answer correct to one decimal place. 

Solution:
4 5 +15.4÷4 = 4 5 +3.85 =0.8+3.85 =4.65 =4.7 (one decimal place)


Question 6:
Calculate the value of 84 – 3(14 + 48 ÷ 6) =

Solution:
843( 14+48÷6 ) =843[ 14+( 48÷6 ) ] =843( 14+8 ) =843( 22 ) =8466 =18


Question 7:
Calculate the value of  4×0.18 0.9 .

Solution:
4×0.18 0.9 = 0.72 0.9             = 0.72×10 0.9×10             = 7.2 9             =0.8


Question 8:
Calculate the value of ( 8.42.64 )÷ 4 3  and express the answer correct  to two decimal places.

Solution:
( 8.42.64 )÷ 4 3 = 5.76 1.44 × 3 4 =4.32

Leave a Comment