Make an equation out of the statement "51 is 6% of what number".
Remember:
-- 6% means 0.06
-- "is" means the same as "equals"
-- in math, "of" almost always means "times"
Give the answer a label, and you'll be ready to begin.
Let's call it ' M ' for "mystery number".
51 is 6% of (the answer)
51 = 0.06 x M
Can you solve that equation and find out what ' M ' is ?
What if you divide each side by 0.06 ?
Then it says
51 / 0.06 = M
Pick up your pencil or your calculator, and divide 51 by 0.06 .
You get 850 . Now your equation says
850 = M
Isn't that exactly what you want ?
It says 'Mystery number' is 850 .
Try it on your calculator.
Take 6% of 850 . You'll get 51, just like the problem says.