7) 213 x 37 + 213 x 39 + 23 x 213 + 213

= 213 x ( 37 + 39 + 23 + 1)

= 213  x 100

= 21300

8) 9 + 9 x 3 + 18 : 2 x 6

= 9 + 9 x 3 + 9 x 6

= 9 x (1 + 3 + 6)

= 9 x 10

= 90

9) 2007 x 16 – 2007 x 14 – 2007 x 2 + 2007

= 2007 x (16 - 14 - 2 + 1)

= 2007 x 1

= 2007

7) 213 x 37 + 213 x 39 + 23 x 213 + 213

= 213 x ( 37 + 39 + 23 + 1)

= 213  x 100

= 21300

8) 9 + 9 x 3 + 18 : 2 x 6

= 9 + 9 x 3 + 9 x 6

= 9 x (1 + 3 + 6)

= 9 x 10

= 90

9) 2007 x 16 – 2007 x 14 – 2007 x 2 + 2007

= 2007 x (16 - 14 - 2 + 1)

= 2007 x 1

= 2007