Okay, here we have this:
To estimate 47% of 70 we are going to:
Find 1% and multiply it by 7
Find 10% and multiply by 4
Add the two found values
Let's do it:
To find 1% of 70 we are going to divide 70 by 100, this is equivalent to running the decimal point two times:
1% of 70=70/100=0.70
0.70*7=4.9
To find 10% of 70 we are going to divide 70 by 10, this is equivalent to running the decimal point once:
10% of 70=70/10=7
7*4=28
Now, let's sdd the two found values:
47% of 70=4.9+28=32.9
Finally we obtain that the 47% of 70 is equal to 32.9.