3.2.1 Fractions, PT3 Practice


Question 1:
3 2 5 +1 5 6 1 5 =

Solution:
3 2 5 +1 5 6 1 5 =3 12 30 +1 25 30 6 30 =4 37 30 6 30 =4 31 30 =5 1 30


Question 2:
6 1 12 3 2 3 1 5 6 =

Solution:
6 1 12 3 2 3 1 5 6 =6 1 12 3 8 12 1 10 12 =( 5 13 12 3 8 12 )1 10 12 =2 5 12 1 10 12 =1 17 12 1 10 12 = 7 12


Question 3:
30( 2 7 ÷ 2 21 )=

Solution:
30( 2 7 ÷ 2 21 ) =30( 2 7 × 21 3 2 ) =303 =27


Question 4:
( 7 1 2 3 2 3 )× 12 69 =

Solution:
( 7 1 2 3 2 3 )× 12 69 =( 7 3 6 3 4 6 )× 12 69 =( 6 9 6 3 4 6 )× 12 69 =3 5 6 × 12 69 = 23 6 × 12 2 69 3 = 2 3


Question 5:
1 1 5 ÷( 42 1 2 )=

Solution:
1 1 5 ÷( 42 1 2 ) =1 1 5 ÷( 3 2 2 2 1 2 ) = 6 5 ÷( 1 1 2 ) = 6 5 ÷ 3 2 = 6 2 5 × 2 3 = 4 5

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