Finding the whole from a part and a percent

Given that 15 is 20% of a number, recover the whole. The reverse of percent-of, and the one used in real life.

Standards:6.RP.A.3.c

Try it: three questions

Real questions from the practice bank. Tap an answer to check it.

Question 1 of 3

A baker made some cookies. He sold 36 cookies, which is 40% of all the cookies he made. How many cookies did he make in total?

Question 2 of 3

Maya read 45 pages of her book, which is 30% of the total. How many pages are in the whole book?

Question 3 of 3

Maria read 45 pages of a book, which is 30% of the total pages. How many pages does the entire book have?

How this fits in

Finding the whole from a part and a percent is one skill in the Ratios & Proportions unit. Students read the unit lesson, then earn a bronze, silver, or gold medal on their last 10 answers. Medals never go down. A mastered unit comes back for review after 1, 3, 7, 16, and 35 days so it stays learned.

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