A Grain of Rice

There is an old story about a grain of rice that is a famous math problem. In a kingdom long ago a poor man saved the son of the king from drowning; the king told the man he would give him 1000 gold coins as a reward; the poor man said all he wants is one grain of rice on the first day of the month and double the amount each day of the month. The king was surprised; he told the man he was a good man for asking for so little.



Here is the math problem. Here is the question: if the man has one grain of rice on the first day; two on the second day and four on the third day; how many grains of rice will he have after 30 days?



Use the calculator and google to solve the problem.



Step 2: Click on the link to the right called A Grain of Rice. For every question you get right rice is donated to the poor by The United Nations. Find the math problems on the site and see if you can make it to level 10.