Use six 9’s to make a numerical expression that equals 100.
At a large party in a Chinese restaurant (Wok Around the Clock), every three guests used a bowl of rice among them, every four guests used a bowl of soup among them, and every pair of guests used a bowl of fish between them. There were 65 bowls of these three things altogether. How many guests were at the party?
Jasper had his marbles out on the floor the other day. His little sister Pearl was putting them in equal piles, or trying to. When she tried to put them in two equal piles, she had one marble left over. When she tried to make three equal piles she had two marbles left over. When she tried to make four equal piles, she had three marbles left over. Then she got mad and threw all of the marbles under the piano. Jasper pulled them all out (he didn’t lose any, and he kept his temper) and put them into seven equal piles, with no marbles left over. How many marbles does he have?
In the 1870’s, on a farm along the Ohio River, a girl was presented with three gifts: a rooster, a goose, and a duck. The duck had cost 20 cents. The rooster and the goose together cost twice as much as the duck. The goose and the duck together cost three times as much as the rooster. How much did the goose cost alone?
Add these numbers. They’re too big to fit into your calculator, but you can use a calculator to figure out the answer anyway. Go for it.
How many different numbers between 1/8 and 1/2, inclusive, can be displayed on your shiny new 8-digit calculator?
The following diagram is composed of 10 overlapping circles, each identified by a letter. Each letter has a different whole number value from 1 through 9; since there are two circles labeled H, H will have the same value for both circles. Where some circles overlap, there is a number indicated: This number is the sum of the values of the letters in the overlapping circles. Can you figure out the correct numerical value for each letter?
Answer this question yes or no: If the problem you solved before you solved the problem you solved after you solved the problem you solved before you solved this one, was harder than the problem you solved after you solved the problem you solved before you solved this one, was the problem you solved before you solved this one harder than this one?
Show how you decided.
All of my pets except two are dogs, all but two are cats, and all but two are snakes. How many pets do I have?
Which of the four cubes on the right could be simply another view of the cube on the left? No cube has two sides alike.