for this question, we can cut it in three different calculations.
1---1x10=10
2---3x1=3
3---9x1/10=9/10=0.9
add them together=10+3+0.9=13.9
i million=1,000,000
137 million=137,000,000
0.5 million=500,000
137.5 million=137,000,000+50,000=137,500,000
so, 137.5 million takes away 100=137,500,000-1000=137,499,000
A times by A would be A2
so, if the question gives you A2 , then you could work out the square root of A2 woudl be A.
