Do not use a calculator for the following!!

The 10% Rule The 10% Rule The 10% Rule What is an easy way to find 10% of a number?

How do you find10% of 20? Where's the decimal point? 20 Right there!

Move the decimal point 1 place to the left 20

That makes10% of 20 equal to 2

. What is 10% of 7 700 .7 .07 70?

What is 10% of 70? 7 70

. What is 10% of .3 30 .03 3 30?

What is 10% of 30? 3 30

. What is 10% of 1.2 12 .12 .012 120?

What is 10% of 120? 120 12

. What is 10% of 4.5 .45 450 .045 45?

What is 10% of 45? 45

. What is 10% of 3.50 .35 350 .035 $3.50

What is 10% of $3.50 or 35 c $35 $350

. What is 5% of .50 .5 5 50 100?

% means "out of 100" The answer is 5 therefore, 5% means What is 5% of 100? % means "out of 100" The answer is 5 therefore, 5% means "5 out of 100"

10% of 100 = 10 2 2 The "total" is the same 5% of 100 = 5

. What is 5% of 4 6 2 .4 40?

What is 5% of 40? 10% of 40 is of 40 is 4 2 2 2 5%

. What is 5% of 4 6 8 16 80?

What is 5% of 80? 80 4 2

. What is 5% of 4 2 8 16 160?

What is 5% of 160? 160 2 8

. What is 15% of 2 6 8 10 40? 10% of 40 = 4 + 5% of 40 = 2 15% of 40 = 6

. What is 15% of 12 60 18 100 120? 10% of 120 = 12 + 5% of 120 = 6 15% of 120 = 18

. What is 20% of 12 60 18 100 90? 10% of 90 = 9 + 10% of 90 = 9 20% of 90 = 18

. What is 30% of 30 60 45 90 150? 10% of 150 = 15 + 10% of 150 = 15 30% of 150 = 45

. What is 25% of 18 6 15 12 60? 10% of 60 = 6 + 5% of 60 = 3 25% of 60 = 15