Question

Can u pl help me with these question in the pic and show how to wrok them out plzz

Answer 1

18)
`\sf 28 * 9 = 20 * 9 + 8 * 9 = 252`

19)
`\sf (4)/(7) * 98`


`\sf remember ~ that~98 ~can~also~be~written~as ~ (98)/(1)`


`\sf (4)/(7) * (98)/(1) = (4~*~98)/(7~*~1) = (392)/(7) = 56`

20)
`\sf (6)/(10) + (1)/(10) + (4)/(10) = (6~+~1~+~4)/(10) = (11)/(10) = 1 (1)/(10)`

Answer 2

18)
The Last case is 252 because 28 * 9 = 252.
Second Case is 9 because 8*9 = 72, and 252 - 72 = 180, then you divide 180 over 20, and you get 9.
So, 28 * 9 = 20 * 9 + 8 * 9 = 252

19)
in Math, when they say "of", it means you need to multiply, so you get:

`(4)/(7) * 98`
do it on the calculator and you get 56.

20)
To add fractions, they need to have the same denominator. Since here they got the same (10), you get:

`(6)/(10) + (1)/(10) + (4)/(10)`

`(6+1+4)/(10)`

`(11)/(10)`

Hope this Helps! :D